mckinsey problem solving test practice test c

McKinsey PST: Question Types, Study Plan & Mock Tests

The McKinsey Problem Solving Test (McKinsey PST) is a very crucial part of the McKinsey recruitment process. It is where most of the applicant pool is eliminated, and yet there are so few resources to help you prepare for it. Fortunately, you’ve found the ultimate guide to nail the test with an unbelievable level of detail!

Table of Contents

McKinsey PST overview

What is the mckinsey pst.

The McKinsey Problem Solving Test (or PST) is a paper-based test used at McKinsey & Company to select candidates for the case interviews. The PST is conducted after resume screening; it has 6 types of question, testing the candidate on 3 crucial problem-solving skills – data interpretation, mental calculations and logical reasoning.

McKinsey PST passing score / Acceptance rate

McKinsey has never officially stated the passing score or acceptance rate for the PST. However, these numbers can be estimated using reports from test-takers, with passing score being around 70%, and acceptance rate at roughly 30-35% (1 in every 3 candidates will pass).

Does McKinsey still use the PST?

Currently, the McKinsey PST is being replaced by the new Problem-Solving Game. However, the transition is not complete globally. In addition, the new Problem-Solving Game still retains the core principles from the old test, so preparing for the PST is still relevant.

Why do they need PST?

It’s very similar to what we have here! McKinsey believes that the gap between CV screening and in-person case interviews is too big. The firm may miss many good candidates with bad resumes or may interview too many candidates who don’t live up to their resumes.

At the end of the day, in-person interviews are expensive, and the Problem Solving Test provides a cost-effective solution.

Who has to take the McKinsey PST?

Every candidate who passes the resume screening round has to take the McKinsey PST – if they apply for the management consulting track. Some report indicates that MBA applicants might be waived from the test – however, this is rare and you should confirm with the target office HR.

What does PST look like?

26 questions, 1 hour, paper-based, and no calculator! The test has 26 multiple choice questions set within the context of 3 business cases. A candidate has exactly 60 minutes to finish the test. He will be provided with a watch, pencils, scratch paper, and the test is in a paper-based format. No calculator is allowed. No personal assistant is allowed. Just you and the test!

As the business landscape is changing, candidate recruitment has become increasingly complex. This requires another way of presenting PST content for McKinsey. They have changed the format into gamification and planned to implement this method to all McKinsey offices within 2020. Visit the mock game designed exclusively for MConsultingPrep followers!

PST vs. GMAT vs. SAT?

If you are new to PST, you may hear the myth that PST is similar to the Math section in GMAT or SAT. In fact, being excellent in SAT Math does help with quantitative calculation in PST, however, the context is different. The SAT Math section includes only simple calculations in simple context; meanwhile, logic in business problems is highly emphasized in PST.

Why is this test so challenging?

• You will not have enough time to properly think through each question.

If you are going to read every single word in the case background and do every calculation “asked”, you will not be able to finish the test. You will need to know how to work through stress and pressure, how to give out “high-probability” answers instead of “exactly-right” ones, and how to painlessly skip questions.

• You will be judged by a machine (or if by a person, they will try to be like a machine).

I myself feel much more comfortable in an in-person case interview, where I will be fine as long as I have the right tactics. The interviewers generally allow candidates to make a few mistakes here and there, to slow down the process if needed, and to ask for help when necessary. In the PST, the result is all that matters. There will be no mercy granted. If you don’t get enough correct answers, you are out.

• On top of those, the questions themselves are hard!

A huge amount of logical and analytical reasoning is required. You will need to really grasp the logical fundamentals of how management consultants solve problems, e.g: the difference between a conclusion vs a hypothesis; etc.

How to prepare for the McKinsey PST?

Step 1 : Seek confirmation from the target office if you must take the PST

Step 2: Get familiar with official sample tests from McKinsey

Step 3 : Learn the logic of each question type, common mistakes, and how to answer correctly

Step 4: Practice mental math to improve calculation speed and accuracy

Step 5 : Practice speed reading and data selection

Step 6 : Practice answering individual question type under time pressure

Step 7 : Do one mock test with simulated test conditions

Step 8 : Review the test and your performance

Step 9 : Return to step 3, 4, 5, 6 to for further practice on weakness

Step 10 : Do mock test again, repeat until you can confidently hit 90% or more

McKinsey PST question types

Some emailed me and asked what they should do if there were 3 days left until the PST. I would still suggest you follow our spirit of learning. When you have little time, choose which question you want to prioritize, tackle it carefully and decide how deep you will go into it. If I were in your shoes, I would use this prioritization table

In addition to the above, I would suggest you practice your math in these last days. The learning curve at the beginning is usually high for anything, including  Mental Math . Doing better math can significantly improve your test score. It reduces simple mistakes (which can still cost you points) and allows you to have more time for other questions.

McKinsey PST study plan

These are the same steps I took to pass the PST years ago, and the basis for my product – the PST Comprehensive Package which has helped countless candidates pass this notoriously difficult consulting test.

Step 1. Answer the questions correctly

You are recommended to first answer all the test questions correctly without time pressure. Before, you need to break down all the questions into 6 question types as below. Besides, it is necessary to understand how these questions are constructed, what are their logical foundation, and even how the wrong choices are made.

Step 2. Answer the questions quickly

There will be no turning point that indicates you it is about time to move to the second step, but you should gradually try to answer the questions both correctly and quickly. Once getting all the correct answers without clocking, you should put yourself under time constraint. If you don’t know how to increase your speed, you have better to start with 3 tips below:

#1. Increase your reading speed.

The PST contains 3 business cases with various number and case context, which requires you to read as fast as possible (of course correctly). Many candidates cannot finish their PST because of being overwhelmed in text. The Princeton intensive program is helpfulto increase your speed by 2 times faster without difficulties.

#2. Increase your calculator speed.

Half of the test involves math, which have no way to improve but practice rigorously. The more you practice, the better you gain. If you haven’t found any efficient tips, try our method to score well with Mental Math!

#3. Embrace test-hacking tips.

After years of coaching students to MBB, I have collected wonderful tips and tricks to nail your test with less effort! Find out some of those tricks as below or check out the McKinsey PST Comprehensive for more detail!

Reading facts

Reading-facts is the most common question type in the McKinsey PST (38%) and the BCG Potential Test (up to 100%). These questions test your ability to understand the facts/data itself. There will be no inferring, logic, hypothesizing, or creativity needed. Instead, proficiency in chart reading and calculations will be handy here. See the picture below for an illustration.

QUESTION FORMAT

The following are a few examples of typical question formats:

• Which of the following values is the best estimate of…?
• Which of the following statements is valid based on the data…?
• Which of the following can be concluded from Exhibit…?

Sometimes even though the word “conclude” is used, questions don’t require any logical reasoning, just your ability to read facts and perform basic calculations. In these cases, I still classify these questions into the reading-facts category.

SAMPLE QUESTION

This question is written based on an official McKinsey practice PST.

Which of the following statements is valid based on the data in Table 1?

A) Soccer revenue was more than $325 thousand five years ago

B) Tennis revenue grew by no less than 1.2% in each of the last five years

C) The total revenue of Saigon League did not grow at all in the last five years

D) If the growth rate in the last 5 years is maintained, Soccer revenue will be more than $420K 5 years from now.

You will see that no tricky logical reasoning is needed here. All you need in order to answer these questions is the ability to read the table and perform calculations correctly.

COMMON MISTAKES

A good way to determine the correct option is to investigate if the other three are wrong. Now there are two ways you can be wrong in this type of PST question: (1) Incorrect calculation and (2) Misread the facts/ data

Type #2 is harder to understand, so I will dive deeper into that here. Let’s look at the sample question above. Hope you got D, the correct choice.

Example 1: How you can misread the data – Why A is wrong

If you overlook the phrase “Average annual” on column 3′s title, then Soccer revenue 5 years ago would be: $342.8 k / (100% + 4.5%) = $328 k, which is more than $325 thousand. Revenue grew at an average rate of 4.5% in EACH of the last 5 years. It is NOT 4.5% over the whole period of 5 years.

Example 2: How you can misread the data – Why B is wrong

If you overlook the phrase “Average” in column 3′s title, then it seems like the growth rate for each of the last 5 years is exactly 1.2%, no more, no less. B, therefore, seems correct. However, as indicated in the table, 1.2% is just an average figure, which means there are years with a lower or higher growth rate.

Example 3: How you can misread the data – Why C is wrong

If you overlook the second column of the table (Revenue this year column), then it seems like the average overall growth rate for Saigon League is 0% (4.5% + 3.3% + 1.2% – 9% = 0%), which makes C correct. However, different lines have different sizes. Even though Golf had negative growth of 9%, it is a relatively small line so its impact on the overall rate is small as well.

Hope that you will not make this mistake in your real PST. Again, PST is a simple test… when you have enough time!

PREPARATION GUIDE

Skill #1: Calculation

We have a detailed article on Consulting Math and how to strengthen your quantitative proficiency.

Skill #2: Chart/exhibit/table reading

Always take a moment to read and understand every single chart or graph you encounter in your everyday life.After all, practice makes perfect.

You can also improve your reading speed through an amazing speed reading program by Princeton University .

Skill #3: Attention to details

The devil is in the details. It’s the little things that can make or break a project, and no true consultants would let themselves be caught unaware.

Develop a habit in daily life. Have the mindset that I am not going to miss any stupid details.

For every practice question you get in this type, make sure you understand not only why an answer is right, but also why an answer is wrong, exactly like what I did above.

PRACTICE QUESTIONS

Which of the following statements is valid based on the data provided on Graph 3 above?

A) The Service-to-Agriculture ratio increased by more than 3 times between 1995 and 2007

B) Service GDP in 1995 is more than Industry GDP in 2007

C) Agriculture is where GDP value dropped the most between 1995 and 2007

D) In 2007, Service GDP is no less than 6 times Agriculture GDP

Correct answer: D

If you want to practice more, check out my PST Comprehensive Package for questions and answers!

Fact-based conclusion

Once you get into consulting, you will probably hear the term “fact-based” a million times a day. Consulting is the business of making conclusions based on facts. Consultants face tons of different problems throughout the course of any project: from the top to the granular level, from function to function, from industry to industry, etc. Fact-based conclusion is such a fundamental aspect of consulting that it weighs in heavily on the PST.

Fact-based conclusion questions test your ability to draw and recognize sound and logical conclusions based on a set of data/facts provided. See the picture below for an illustration.

• Which of the following statements is a valid conclusion based on …?
• Which of the following statements can be concluded from …?

The McKinsey team has an interview with the Chief Operating Officer of the New Bingham Mine, Salt Lake City. During the interview, the following facts have been gathered:

• The factory must have at least one safety inspector 24 hours a day, seven days a week, in accordance with Federal and State labor regulations.
• To maximize operational efficiency, there must be exactly 10 line workers operating the mine.
• The mine operates from 8 am until 5 pm, Monday to Sunday.
• The mine employs 4 safety inspectors and 16 line workers to make 20 workers in total.
• The total weekly labor cost for the Bingham Mine is $16,000.

Which of the following statements is a valid conclusion?

A. One-fifth of the total labor cost for the mine is for safety inspectors.

B. At least one safety inspector must work more than 40 hours per week.

C. Line workers do not work more than 40 hours per week.

D. The majority of the mine’s labor cost is for line workers.

A – Fit-well but not fact-based

There are 4 inspectors out of 20 employees so it seems like the cost of the inspectors can very well be 1/5 of total labor cost. But a missing piece of data to conclude that is: does each person get a similar total income?

C – Fit well but not fact-based

The mine opens for 9 hours per day, 7 days per week, and there must be 10 line workers at a time, so it is 630 man-hours per week at the line positions. There are 16 line workers, so on average each of them only needs to work 39 hours per week. This seems to fit very well with the proposed conclusion: line workers do not work more than 40 hours per week. However, a missing piece of data to conclude is: does every line worker work the same amount of time (if not, there can be some who work over 40 hours while others work less)?

D – Fit well but not fact-based

Similar to A, there are more line workers, so it seems like the total cost for line workers is more than the total cost for safety inspectors. But a missing piece of data needed to conclude is: does each worker get paid the same amount?

=> Only B is proven true by the provided facts

There are 24 * 7 = 168 inspector hours needed in a week, equaling 42 hours per week per inspector. So there must be one who works more than 40 hours.

Identifying proven true conclusions is an important foundation to master all conclusion-related questions. However, most conclusion-related questions in the McKinsey Problem Solving Test will be given in other formats. In this section, we will learn about the two types of twists: (1) False conclusions and (2) Conclusions reversed . Let’s start with the first one.

TWIST TYPE 1: FALSE CONCLUSION

Any proposed conclusion must fall into one of the following three groups: Proven True, Proven False, and Unproven. This twist is when a question asks you to identify the False Conclusion instead of the True Conclusion.

• Which of the following statements is FALSE based on …?
• Which of the following statements is FALSE based on … ?

METHODOLOGY

A proposed conclusion is proven false when you can point out at least one instance where the conclusion is wrong. Similarly, with true conclusion questions, unproven conclusions should also not be selected.

Notice that proven FALSE conclusions are NOT conclusions not proven TRUE. A conclusion will stay unproven until it is proved to be TRUE or FALSE.

Which of the following statements is FALSE based on Table 1?

A. A, Inc. had lower average economic growth in the last five years than D, LTD.

B. A, Inc. had higher average economic growth in the last five years than D, LTD.

C. Investment risk rating is based on the difference between maximum and minimum revenue growth in the past five years.

D. Potential rating is based on the maximum recent revenue.

Of A and B, A seems to be false and B seems to be true. However, both of them are unproven. The maximum and minimum figures are not enough to conclude the average.

We don’t know if C is right or not, but we know that it is not proven false. In the provided data, there is no instance where the larger difference between maximum and minimum recent revenue growth indicates smaller risk (and vice versa).

With D, we know for sure that it is proven false because we can point out an instance where the assertion conflicts with the data (B Corp. vs. D, LTD.).

TWIST TYPE 2: CONCLUSIONS REVERSED

Very often, conclusion questions in the McKinsey Problem Solving Test are given in a reversed format. You will be given the conclusion first and asked to pick what facts/ data would be enough to come up with that conclusion.

The key to answering this type of question is to recognize which proposed fact makes the stated conclusion proven or unproven.

This question is written based on an official McKinsey practice PST:

FOCUS Travel is a premium Russian tourism company, offering tours to South East Asian countries. Facing the economic downturn, FOCUS revenue has been hurt badly. While the CFO (Chief Finance Officer) proposed an overall price cut to stay competitive, the CMO (Chief Marketing Officer) is concerned that a price reduction would negatively impact the premium perception of the brand, which drives a lot of sales.

Which of the following statements, if TRUE, would best support the CMO’s assertion?

A. In a recent survey, FOCUS’s customers quoted “price” as the most important indicator in choosing travel agencies in a list of ten factors.

B. In a recent survey, FOCUS’s customers quoted “price” as the most important indicator of quality in a list of ten factors.

C. In a recent survey, there were customers who said they would not buy FOCUS’s services if there was a 10% price increase.

D. In a recent survey, there were customers who said they would not buy FOCUS’s services if there was a 10% price decrease.

In this question, the “conclusion” has been given to us: Price reduction will negatively impact the premium perception, which will in turn negatively impact sales.

Of the four proposed answers, which facts are enough to prove the provided “conclusion” above?

A: This fact is only enough to conclude that price will impact sales. Not enough to prove that price reduction will negatively impact sales.

C: This fact is irrelevant.

D: This fact is not enough to conclude that price reduction will negatively impact sales because not all customers say so. The word “there were” can be understood as either a minority or a majority. It is only enough to conclude the proposed conclusions when “there were” is replaced with “the majority of” or “all“ .

With B, we can logically infer that price reduction will negatively impact the quality perception, which in turn will hurt to sales.

3.3. Root-cause reason

This question gives you a particular set of facts/data and asks you to identify what could be the cause for them. When doing a real consulting project, we consultants have to find out the root-cause reason. There may be various reasons that can cause the current situation, but the root-cause reason will help us tackle and solve it more efficiently. You can see the picture below for an illustration.

The following are a few examples of typical root-cause reason question format:

• Which of the following reasons, if TRUE, will help explain the Facts …?
• Which of the following does NOT explain the Facts …?
• Which of the following points is NOT a valid reason for the Facts …?

Only B is proven true by the provided facts

Facts provided: Visits to the website MConsultingPrep were relatively low last month.

Root-cause Reason Question: What reasons, if TRUE, would help explain the low traffic to MConsultingPrep last month?

The correct answers can be any of the following:

1. The quality of contents has been bad

2. Because of technical issues, some visitors could not access the website

3. Last month was December when the overall demand for job prep materials is lowest in the year

4. Other new consulting prep blogs opened recently

Fact-based Conclusion Question: What can be concluded from the data provided?

All of the statements above can be the reason for the stated fact, but NONE of them can be concluded from it.

An example of a statement that can be concluded: Because the conversion rate stayed constant over the years, revenue last month was relatively low.

What makes a statement NOT a potential reason for a particular fact?

There are two ways a statement cannot be the potential reason: (1) Wrong Subject and (2) Wrong Trend.

• A statement is (1) Wrong on Subject when the subject is irrelevant, which means the statement has zero effect on the phenomenon mentioned in the stated fact.
• A statement is (2) Wrong on Trend when the direction is reversed, which usually means the statement has a reversed effect on the phenomenon mentioned in the stated fact

Illustrative example Let’s continue with the simple example above. The Stated Fact: Visits to the MConsultingPrep blog were relatively low last month. (1) Example of a “Wrong Subject” statement: “Some new Investment Banking Prep blogs opened recently” Here the subject “Investment Banking Prep blogs” is irrelevant to the stated fact. The statement (1) will have zero effect on the stated fact. (2) Example of a “Wrong Trend” statement: “Some other existing Consulting Prep blogs closed recently” Here, even though the subject “Consulting Prep blogs” is relevant, the trend is reversed. The exit of Consulting Blogs will increase visits to MConsultingPrep. Therefore, statement (2) will have an opposite effect on the stated fact.

PRACTICE QUESTION

Fletcher is a major Steel producer in the Pacific continent. It has markets in New Zealand, Australia and other South East Asia countries. Of many types of steels, re-bar (reinforced bar) is typically used in high-rises and big construction projects.

There are three main groups of steel consumers in New Zealand:

• Homeowners purchase steel at retail sizes for purposes of self-constructing and self-renovating their homes
• Scaled private construction companies, who often contracts large construction projects and steel orders
• State-owned Enterprises (SOE), who build government’s projects such as roads, bridges, schools, hospitals, etc. (SOEs usually have bargaining power since steel providers need governments’ permissions in order to be legally used in particular countries.)

Table 1 below shows the size of re-bar steel market (in billions of $US)

Which of the following statements, if TRUE, best explains why future trends for South East Asia sales differ from sales in the other two markets?

A) South East Asia population is expected to grow strongest, which lead to high steel demand from individual homeowners.

B) South East Asia economy will be heavily based on SOE, so will the construction market.

C) South East Asia economy will shift toward privatization, so will the construction market.

D) Developed markets of New Zealand and Australia will have the most advanced steel production technology and facilities.

Correct answer: C

Word Problem

Word Problem is a quantitative question where the answer cannot be calculated directly from the data provided. Usually, we have to set up one or more equations in order to solve this kind of question. Word Problem questions in the McKinsey PST and Case Interviews are just the word problems we usually see in schools, GMAT… but put into business contexts. The method to solve them, therefore, is the same.

Table 1: Data on the Washing Room of Jean Valjean Restaurant

Suppose the restaurant opens 350 days a year. There are 3 meal shifts per day, 1 shift lasts 3 hours, 1 customer uses an average of 5 dishes per visit, and currently the restaurant hosts 530 customers on average daily.

What percentage of increase in the number of daily visits would be required in order to make purchasing the machines financially beneficial?

Step 1 . Convert data/facts into manageable and standardized format and units (only needed for complex questions).

Step 2 . Set up an equation with one (or more) unknown variables, i.e. X, Y, Z, etc.

Tips: Don’t worry about having to make the variable as the question asked. Just set up the equation in a way that makes the most sense to you as long as the variables can be easily converted to the asked variable. It will save much more time and helps you avoid silly mistakes.

Step 3 . Solve the equation and get the answer.

METHODOLOGY ILLUSTRATION

Let’s solve the sample question above together.

Step 1: This is a very complex question with many non-standardized and not ready-to-use data. If I am going to tackle this question on my PST, I would convert the provided figures and write them out on a table as follows.

Notice that I have converted all the necessary data points into the same unit of “Franc per day”.

The only data point not fully converted is the Labor cost in Manual Process (measured by the “per dish” variable), yet I want to make sure that I go as far as I can.

See how simple the problem is now!

Step 2: Now that we have very manageable data, let’s go ahead and set up an equation that will help us find the answer. The asked variable here is: what percent increase in current daily visits does Jean Valjean need?

As mentioned above, it is NOT necessary to put the variable question is looking for in the equation. In this case, doing so will result in a very awkward and complicated equation.

Instead, I set up the equation that makes the most sense to me (do note that there is more than one way to set up equations). Let Y be the “break-even size” (measured by people). I can easily calculate the percentage asked for after getting the break-even size.

Cost per day of Manual Process = Cost per day of Machine Process

Washing cost + Set up cost = Washing cost + Set up cost + other cost

Y x 5 dishes x 0.1 Franc + 30 Franc = 270 Franc + 90 Franc + 200 Franc

After executing step 1 and step 2, the problem becomes a lot easier. Now we have:

0.5 Y = 530

Y = 2 x 530

Once we have Y (the new “break-even” visit volume) of 2 * 530, we can quickly convert Y into the asked variable: What percent increase of 530 customers/day does Jean Valjean need?

The final answer is C.

Client Interpretation

In every consulting project, communication with the clients’ top-level (usually the Chairman or CEO) is always important. During my time with McKinsey, we usually hear an update every one or two weeks from our Project Director (usually a partner) on his meeting with the clients’ top level. Messages from those meetings are important on-going steers for the project. No surprise it makes up an entire question category in the Problem Solving Test.

Client Interpretation questions test your ability to read, understand, and interpret the messages the client is trying to convey in the case question or description. To some extent, this is very similar to GMAT verbal questions.

• Which of the following best summarizes the CEO’s concerns?
• Which of the following statements best describes the thoughts of the CEO regarding…?
• Based on the opinion of the head of the Department, which of the following statements is valid?
• Which of the following statements best describes the CEO’s aims for the McKinsey research?

Case context:

Mommy said she saw some dirty clothes on the dining table. She is also quite shocked to see Kevin’s toys in every room throughout the house. She even complains about how much time it takes her every night to clean up Kevin’s mess. “I will have to have a very straightforward conversation with Kevin tonight!”, said mom

Which of the following statements best describes the Mom’s concern?

A. Mom is not happy about too many of Kevin’s toys sitting on the dining table

B. Mom does not expect to see that many of Kevin’s toys in the house

C. Mom does not like to be responsible for anyone’s mess

D. Mom is too busy these days

E. Mom wants to talk to Kevin

F. Mom wants Kevin to be tidier

In this example, we continuously get small data points, all leading to one bottom-line, not explicitly mentioned but can be reasonably interpreted:

Kevin is too messy and mom doesn’t like that!

Notice that, the bottom-line here is not explicitly stated but it IS the bottom-line. All 4 sentences in the case context are small pieces of data leading to that final “so-what”. Having this “so-what” in mind, you can just skim through the answer and quickly pick F without concern about other choices.

In case you are curious about how other choices are “wrong-choice” …

Choices B and E are in fact right according to the case context, but not the bottom-line.

Choices A is simple wrong according to the case context (Tip #2)

Choices C and D are neither right or wrong according to the case context. There are not enough “evidence” to be reasonably interpreted using common sense.

TIPS AND TRICKS

Tip #1: Read the case description before going to multiple choices!

Normally the strategy of scanning through the answers first before going back to the case description works when you have a very long case description and don’t know where to look for the right information. Scanning through the answers helps you get a more focused read on the case description. However, the client’s assertion is typically found in a very short and specific part of the case description. So once you realize it’s a Client Interpretation question, go back to the case description and find that very specific part of the client’s assertion. Make sure you understand it very well. Then the rest of the work is just determining which of the four choices has the same meaning as the original assertion.

Tip #2: Cross out some obviously wrong choices …

… by recognizing a few words or short phrases that make a choice incorrectly reflect the client’s assertion. Sometimes, you can do this very quickly and effectively. If not, please see tips #3.

Tip #3: Catch the bottom-line, the “so-what” of client’s assertion

Client’s expression as quoted in the case context is always a bit blur and confusing. That is very realistic of what you may encounter in the real consulting work. It also makes these question types challenging. But in almost every situation, there is always one “so-what”, stated explicitly or implicitly. The trick here is to catch that so-what, ignore the noise, and go straight for the answer choice. Most of the time, the wrong choices DO contain a part of the client’s assertion, but either not the whole idea or the main, the bottom-line, the most important one!

Using this method, you can fly and land straight to the correct choice, not having to care too much about how wrong choices are made of. But if you are curious, some of the most common wrong-choice types:

• Choice that is simply wrong according to the client’s assertion (Tip #2 above).
• Choice that is in fact right, but is a minor point, NOT the bottom-line of the client’s assertion.
• Choice that seems to be right, but cannot be reasonably interpreted by common sense (not by scientifically supporting logic like in other question types).

Gangnam Market is a convenience-stores chain mainly in the Gangnam district, Seoul, Korea. Though it has been losing money almost every year since 2000, Gangnam Market secures a good deal of strategic locations in the highly populated Gangnam district. Recently, Gangnam Market was acquired by Lotte Mart in its aspiration to expand to the mini-market market. Lotte right away sets up a transformation project to get Gangnam Market back on track. The CEO of Gangnam Market states that aggressive transformation targets are fine for newly acquired stores with a similar operation model with Lotte’s big stores, but he hopes that the parent company is realistic about the convenience-stores model Gangnam has been operating with.

Which of the following statements best reflect the concerns of Gangnam Market’s CEO?

A) He is concerned that Gangnam Market will never be able to transform itself into Lotte system because Gangnam Market only presents in a specific geographic location

B) He is concerned that Lotte Mart sets transformation milestones that are too aggressive and not realistic for newly acquired companies like Gangnam Market

C) He is concerned that Lotte Mart’s transformation milestones are not realistic for companies with different operational model from Lotte Mart like Gangnam Market

D) He is concerned that Lotte Mart’s transformation targets are too high for Gangnam Market because it has been losing money for a while

Formulae questions are generally like word problems in PST where you don’t have to provide the actual numerical results, just the formulae containing letters representing input variables. Normally, the question will provide input variables in letter format and you will be asked to provide the right formulae in letter format (e.g. it takes the process center T hours to process each file. If the speed is doubled, it takes T/2 hours to process each file). This is one of the easiest PST question types on the McKinsey PST. Let’s make sure you don’t lose points on any question of this type in your exam!

Table 3.6.1: Labor Cost and Processing Data – Holcim Missouri plant

Which of the following formulae accurately calculates the annual cement output per worker?

A. (c x p) / (b + w)

B. (c x p) / [(b + w) x 12]

C. 144 x (c x p) / (b + w)

D. 12 x (c x p) / (b + w)

FORMULAE FOR SUCCESS IN FORMULAE QUESTIONS

Formula 1: Calculate first before looking at the given option

A popular technique for multiple-choice questions is to read the answers first before coming back to the facts. However, that technique would not help you with Formulae Questions. The reason for this is that, often, the end-result formula has already been simplified (e.g. canceling out the same variable on both numerator and denominator) as much as possible. It gives you neither the path to get there nor any hints on how to solve the problem. For instance, when you look at the four options in the example above, does any of them give you a sense of what it represents or how to get there? What does (c x p) represent? What do you get by multiplying Cement output by Monthly labor income?

Formula 2: Divide the problem into smaller pieces (take one step at a time)

This is the universal tip for everybody in the consulting industry, and it also works great here! Often, the result cannot be directly calculated from the provided variables. However, if you take an extra step in-between, the problem becomes a lot easier. Let’s solve the sample question above together to illustrate this point. I broke the problem into smaller steps as below:

• Step 1: Annual cement output per worker = Total annual cement output / Total number of workers
• Step 2: Since we already have Total annual cement output of (c), the next step is to calculate the total number of workers. Total number of workers = Total labor cost / Salary of 1 worker Both Total labor cost and salary are provided. Bingo!
• Step 3: Simplify the final formulae

Formula 3: Get the reading-facts tools right

In some aspects, the formulae question is also a tweaked version of reading-facts questions. You still need to read some facts and perform some calculations (with letters instead of real numbers). Therefore, it is important to master those reading-facts tools and apply them here.

Illustration of a usual mistake: Now come back to Step 2 above and explicitly solve it.

Step 2: Total number of workers = Total labor cost / Salary of 1 worker = (b + w) / p

Step 3: Annual cement output per worker = c / [(b + w) / p] = (c x p) / (b + w)]

Chosen choice: A

Unfortunately, A is NOT the correct answer, because the above calculation doesn’t take into account the difference in units – the salary is on a monthly basis whereas the total labor cost is on an annual basis. If you convert the unit, the final choice should be D.

No matter how beautifully you have tackled the problem, you will not get any credit if small mistakes like this slip through the crack. Make sure you don’t get blindsided by this kind of pitfall!

VICEM is a leading cement company in South East Asia. The following data regarding its business and production has been gathered.

Table 3.6.2: VICEM Business and Production data

Clinker factor is defined as the amount of clinker needed to produce 100 units of cement.

Which of the following formulas calculates the amount of clinker (in tons) needed to purchase in a year?

A) [(s x f) / 100] – c

B) [(p – s) / 100] – c

C) (p x f) – c

D) [(p x f) / 100] – c

 ANSWER KEY

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McKinsey and Co Assessments

• 194 questions

McKinsey is one of the world’s leading management consultancy firms.

Careers at McKinsey and Co

McKinsey is a worldwide management consulting firm based in the U.S. It conducts qualitative and quantitative analysis to evaluate management decisions across public and private sector companies.

McKinsey offers a wide range of career paths, including consulting roles, research and analytics positions, digital and technology jobs, and support roles in areas such as finance, marketing, and human resources.

They are continually recruiting talented individuals from diverse backgrounds, including recent graduates, experienced professionals, and advanced degree holders.

As a consulting firm, McKinsey places a strong emphasis on problem-solving skills and critical thinking, and it seeks individuals who are able to work collaboratively and communicate effectively with clients and colleagues.

Careers at McKinsey & Company can offer a challenging and rewarding experience for individuals with a passion for problem-solving, a drive to learn and grow, and a desire to make a positive impact in the world.

McKinsey and Co Application Process

Online application, aptitude tests, problem solving test (pst), personal experience interview, problem solving game, mckinsey case interview, mckinsey fit interview, mckinsey online application.

To begin your Mckinsey online application you need to apply for your role via the Mckinsey career portal on their careers page.

You will be asked to provide information about your professional experience including a copy of your resume and cover letter.

Be sure to tailor your application to the role you’re applying for and emphasize any relevant skills, industry experience, or leadership positions that showcase your suitability.

McKinsey Aptitude Tests

If you meet the minimum requirements for the position and are successful in the application stage you will be invited to take part in a series of aptitude tests.

Tests vary depending on the role you’ve applied for so we’ve put together a comprehensive list of assessments you might be asked to take.

McKinsey Numerical Reasoning Tests

McKinsey uses numerical reasoning tests as part of its recruiting process to evaluate the quantitative skills of potential candidates. These tests are designed to assess a candidate’s ability to work with numerical data and to use quantitative reasoning to solve complex problems quickly.

The McKinsey numerical reasoning test typically consists of a series of multiple-choice questions that require candidates to perform basic arithmetic, analyze data sets, and use mathematical concepts to solve business problems. The test may also include questions related to probability, statistics, and financial analysis.

To prepare for the McKinsey numerical reasoning test, candidates should have a strong foundation in basic mathematical concepts, including arithmetic, algebra, geometry, and statistics.

During the test, candidates must manage their time effectively to ensure that they answer all questions within the allotted time. Candidates must also be able to work quickly and accurately under pressure, as the test is designed to be challenging.

With proper preparation and practice, candidates can improve their performance on these tests and increase their chances of success in the recruiting process.

McKinsey Verbal Reasoning Tests

McKinsey’s verbal reasoning test consists of a series of multiple-choice questions that require candidates to read and analyze passages of text and answer questions based on the information provided. The passages may cover a wide range of topics, but no prior knowledge of the topic is needed. Instead, you must focus on what you can comprehend from the written material.

To prepare for the McKinsey verbal reasoning test, candidates should have strong reading and comprehension skills and be able to analyze complex written material quickly and accurately. Candidates should also have a good understanding of sentence structure, vocabulary, and grammar.

From each passage of text, you will need to decide if a statement in the passage is true, or false or if you cannot tell.

McKinsey Problem Solving Test (PST)

The McKinsey Problem Solving Test (PST) is a standardized test used to assess the problem-solving skills of potential consultants. The test is designed to evaluate a candidate’s ability to analyze and solve complex business problems, and it is a key component of the recruiting process for McKinsey.

The test uses a multiple-choice format and may cover a range of topics, including data analysis, quantitative reasoning, logical reasoning, and critical thinking.

The skills assessed by the McKinsey PST include:

Analytical skills: Candidates must be able to analyze complex data and identify key patterns and trends.

Problem-solving skills: Candidates must be able to identify problems, develop hypotheses, and create solutions to solve complex business problems.

Time management skills: Candidates must be able to manage their time effectively, as the test is designed to be challenging and requires candidates to work quickly and efficiently.

Communication skills: Candidates must be able to communicate their findings and recommendations clearly and effectively, both in writing and in person.

You can practice some official example test questions for the Mckinsey PST test below:

• Example test questions 1
• Example test questions 2
• Example test questions 3

You can also try some free practice tests using our online platform.

Mckinsey Case Interview

The McKinsey Case Interview is a crucial component of the firm’s recruitment process, designed to assess a candidate’s problem-solving skills, business acumen, and communication abilities.

The interview typically lasts for 45 minutes to an hour, during which candidates are presented with a hypothetical business scenario or challenge.

These cases often reflect real-life client engagements, encompassing a wide range of industries and topics. Interviewers may also incorporate personal experience questions and the occasional brainteaser to gauge a candidate’s adaptability and critical thinking skills.

During the case interview, candidates are expected to ask clarifying questions, identify key issues, and develop a structured approach to address the problem at hand. Interviewers will evaluate the candidate’s ability to analyze data, synthesize information, and present logical and well-reasoned recommendations. Strong communication skills, active listening, and an ability to articulate one’s thought process are essential for success in this format.

To excel in a McKinsey Case Interview, candidates should practice with case materials and mock interviews to become familiar with various business problems and frameworks.

Additionally, staying up-to-date with industry trends, financial concepts, and market dynamics will provide a solid foundation for tackling cases. During the interview, demonstrate structured thinking, be hypothesis-driven, and actively engage with the interviewer. Finally, don’t forget to showcase your personal experience and interpersonal skills, as these are equally important to succeed in a consulting career at McKinsey.

Examples of case study scenarios include:

Market Entry Strategy: A leading pharmaceutical company is considering entering a new market with a groundbreaking drug. Evaluate the potential market size, competitive landscape, and regulatory environment to develop a comprehensive market entry strategy and provide recommendations on pricing, distribution channels, and marketing tactics.

Profitability Improvement: A major airline is experiencing declining profits due to increasing fuel costs, intensified competition, and changing customer preferences. Analyze the company’s financials, operational efficiency, and customer segments to identify areas of improvement and propose a detailed plan to optimize cost structure, enhance customer experience, and ultimately boost profitability.

Mergers and Acquisitions: A prominent consumer goods manufacturer is exploring the possibility of acquiring a smaller, niche competitor to expand its product portfolio and market share. Assess the strategic fit, financial performance, and potential synergies of the target company, and provide a recommendation on whether the acquisition should proceed, along with an integration plan for post-merger operations.

Digital Transformation: A large retail chain with brick-and-mortar stores is struggling to adapt to the rapidly evolving e-commerce landscape. Develop a comprehensive digital transformation strategy that includes revamping the company’s online presence, leveraging data analytics for personalized marketing, and reimagining the in-store experience to drive customer engagement and improve overall business performance.

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Personal experience interview

The McKinsey Personal Experience Interview (PEI) is an essential part of the recruitment process, designed to evaluate a candidate’s interpersonal, leadership, and problem-solving skills.

This interview format aims to understand how a candidate has approached and navigated real-life challenges and situations, offering valuable insights into their potential fit within the McKinsey culture. The PEI typically lasts for 20-30 minutes, preceding or following the case interview, and focuses on assessing key qualities such as personal impact, entrepreneurial drive, and leadership capabilities.

To prepare for the McKinsey PEI, candidates should reflect on their past experiences and identify compelling stories that demonstrate their skills and personal attributes. These stories can be drawn from various aspects of a candidate’s life, including professional, academic, and extracurricular experiences. When sharing a personal experience story, it is crucial to follow the STAR (Situation, Task, Action, and Result) framework to ensure a structured and comprehensive response.

Candidates should be prepared to answer follow-up questions, as interviewers often delve deeper into the details of a story to better understand a candidate’s thought process and decision-making abilities. Practicing storytelling and effectively communicating one’s experiences can significantly contribute to a successful McKinsey PEI.

Questions you might be asked in a McKinsey PEI personal experience Interview include:

• Describe a time when you led a team through a challenging situation. How did you motivate the team and ensure a successful outcome?
• Can you provide an example of when you had to deal with a difficult or uncooperative team member? How did you handle the situation, and what was the outcome?
• Tell me about a time when you had to persuade a client or stakeholder to accept your proposal or idea. How did you approach the situation, and what was the result?
• Share an instance where you faced significant obstacles or setbacks in a project. How did you overcome these challenges, and what did you learn from the experience?
• Describe a time when you took a significant risk or pursued an entrepreneurial opportunity. What was your thought process, and what was the outcome?

Mckinsey Problem Solving Game (PSG)

The McKinsey Problem Solving Game (also known as the Imbellus Test) is a computer-based simulation game that McKinsey uses as part of its recruiting process to evaluate a candidate’s problem-solving skills. The game is designed to test a candidate’s ability to work collaboratively, analyze complex problems, and develop solutions to drive organizational change.

The games fall into one of 3 categories:

• Constrained optimization
• Strategy and adaption
• Cause vs. effect

To do well in each category of the game it’s important to prioritize your goals and remember the skills being tested. You should also be sure to read the instructions carefully and understand what you are required to do.

Constrained optimization game

For constrained optimization game types it’s important to ignore irrelevant data and focus on finding a solution to the optimization challenge and navigating the constraints.

Ecosystem design: candidates must decide on the optimal location and species to live in an environment as well as creating a sustainable ecosystem. Specific and plants have interrelationships i.e herbivores eat plants, omnivores eat herbivores and carnivores eat omnivores.

Animal relocation: a natural disaster is killing off an animal ecosystem. Your job is to discover which natural disaster is the cause and move the animal to a suitable location where they can thrive. You will need to analyze a large amount of data to reach a decision and identify key data.

Strategy and adoption game

Ecosystem survival: for this game, you must protect an ecosystem from invasive plant species. To be successful at this game you will need to introduce the right predators and protectors to manage the outbreak. The game tests how long you are able to delay the outcome of the invasion since they will inevitably take over.

Migration management: with limited resources, you must help a herd of animals to migrate - animals die and resources end at each turn; you must make the most optimal choices to keep as many alive with as many resources as possible by the end.

To be successful in both games read through new information at each stage, by comprehending the information slowly and adapting your approach with what you’ve learned.

Cause vs effect game

Disease Analysis: You will be required to analyze large amounts of data to identify why animals are dying in an ecosystem. You must find the problem and the right treatment required.

To be successful in this game, you need to start by identifying what the relevant and irrelevant information is. Then look for logical relationship patterns e.g. when X increases, Y decreases (something causes something else to happen).

The McKinsey fit interview helps recruiters evaluate a candidate’s cultural fit, motivation, and personal qualities. The fit interview is designed to assess a candidate’s alignment with McKinsey’s values, as well as their ability to work effectively in a team and communicate with clients.

The McKinsey fit interview typically consists of a series of behavioral questions that require candidates to provide specific examples of their experiences and achievements. The questions may cover a range of topics, including leadership, teamwork, problem-solving, communication skills, and more.

To prepare for the McKinsey fit interview, candidates should research the company and its culture, and be prepared to discuss their relevant experiences and achievements in detail. Candidates should also be familiar with McKinsey’s values and be able to demonstrate how their personal values align with those of the company.

Questions you might be asked in a McKinsey Fit Interview include:

• Why have you chosen to pursue a career in management consulting, and why McKinsey specifically?
• How do you see yourself contributing to McKinsey’s culture and mission?
• How do you handle stress and maintain a work-life balance in a demanding environment like management consulting?

Practice Aptitude Tests is not associated with McKinsey and Co. We provide preparation services for McKinsey and Co psychometric tests. Our tests are not designed to be identical to any style, employer or industry. Visit https://www.mckinsey.com/careers/search-jobs to find out more.

Sample McKinsey Tests question Test your knowledge!

During an assessment of team performance, a consultant observes that productivity has followed a pattern over the last five days: high, low, high, low, and high. If this pattern continues, what can be expected for the next two days?

A consulting firm has 5 clients in different sectors: finance, technology, healthcare, education, and energy. The billed hours for last month were as follows: finance 120 hours, technology 90 hours, healthcare 150 hours, education 75 hours, and energy 165 hours. Which sector accounted for approximately 26% of the total billed hours?

In a statement made by a consulting firm's CEO, it is mentioned that 'leveraging disruptive technology can drive significant cost savings for our clients'. What is the primary implication of this statement?

• The firm primarily values traditional methods over new technologies.
• The firm recommends that clients increase their spending on technology.
• The firm believes in prioritizing cost savings over technological advancements.
• The firm supports the use of new technology to reduce client expenses.

A new intern at a consulting firm has incorrectly graphed sales data on a timeline, leading to an error in the pattern of data. If the sales were following a consistent monthly increase, and the error showed a sudden spike instead, what is the most likely cause of the discrepancy?

• A miscategorized sale
• A duplicated data entry
• A misinterpretation of the sales model
• A calculation error in the growth rate

A business development manager preparing a presentation with several boxes outlining client segments notes that there are four key segments in a specific market: A, B, C, and D. If A is sized the smallest due to niche specialization, and C is the largest due to its broad appeal, in what order should the boxes be arranged to represent the segments from smallest to largest market presence?

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McKinsey PST: a comprehensive guide

Six question types, skills tested, optimal pst prep: plan and test strategy, practice material, the next level, take our test for free.

• Our PST preparation programmes

McKinsey PST: an adaptive learning approach to pass the test

The McKinsey Problem Solving Test (McKinsey PST) is a data interpretation and critical number reasoning test used by McKinsey to select candidates to be admitted to the first round of case interviews . The use of the PST is the main difference between the McKinsey recruiting process and those of its main competitors. The other distinct element is the PEI, or Personal Experience Interview. However, with this set of questions on personal impact McKinsey closely approximates the fit interviews of other firms.

The McKinsey PST is so notoriously difficult because it tests a very diverse skillset and requires you to work under the tightest of time constraints . Of those candidates good enough to be considered and given the PST McKinsey only pass one in three - where failure means immediate rejection . However, we are proud to say that despite the average PST pass rate being so low, 85% of candidates who use our course pass their own PST . For anyone who doesn't pass, we return half of their money .

This article serves as a guide to help you prepare for your McKinsey PST. We begin with an overview of what the PST is all about - this gives you a five minute briefing on all the essential information and the context of the PST.

Next, we spend some time going through each kind of PST question in turn, providing structured approaches to tackling them, complete with fully-worked PST example questions and specific PST tips and tricks which might come in useful.

Finally, we put everything together, with step-by-step guidelines on how to prepare for McKinsey PST success using our adaptive learning methodology .

Practice tests developed by McKinsey consultants

There are seven key facts which you will need to know about the McKinsey PST:

1. Who Has to Do the PST?

Not everyone has to do the McKinsey Problem Solving Test . Experienced hires and those recruited from top-tier business schools are often spared. However, in general, anyone applying to an entry-level business analyst role will be expected to pass the McKinsey PST to be considered.

If you are not sure whether you will be required to do the PST, your default assumption should be that you will , but you should ask with the HR team at the office you are applying to so as to be certain - this is a perfectly reasonable enquiry to make.

2. Format: 26 Questions, Pen and Paper

The PST is a multiple choice test completed on paper. 26 questions are divided between three business cases . These cases test how you would perform in the different phases of a consulting project: client interaction, problem definition, problem solving, analytical work and implementation. The cases are on the kinds of issues that real consultants will encounter in the field, including problems on market entry, profitability and operational improvement.

3. 60 Minutes

Quite simply, if you had three hours to work on an individual McKinsey PST, you could pass easily without any help. Time is the single major constraint in the PST. You are not allowed to use a calculator , computer or any other time saving device beyond your own brain, you need to make sure you have developed and practiced the required skillset - especially time saving skills - and approach the test as a whole with the most effective possible strategy .

60 minutes equates to just over two minutes per question , with a few minutes at the end to enter answers onto the answer sheet and quickly check everything is in order. Many candidates actually fail simply as they do not allow enough time at the end for this basic task. You have to be ready to work fast!

4. Make or Break

No matter how good your resume is , if you fail the PST McKinsey will not consider you any further and you will not be invited to interview. Remember, there will be hundreds of candidates with comparable resumes and the Problem Solving Test is given precisely to thin down this field. Passing is mandatory. Even after you pass and interview, your PST score will be considered alongside your interview performance to determine whether you are given an offer.

5. 70% Cut-Off

Success in the PST is an absolute function of your score rather than how it compares relative to other candidates - there is no "curve" . As such, performing better than the next candidate will be meaningless in itself. If all the candidates are sub-standard, all will fail.

Whilst McKinsey does not publish the exact cutoff for the PST, the best estimates (based on surveys of successful candidates) place it at around 70% .

One important point to remember is that you should give an answer for every question even if you are not entirely sure . The PST is not scored negatively - that is, for the PST McKinsey will not penalise for incorrect guesses (as per the system many medical students will be familiar with). As such, you should always give your best guess , just in case you get lucky.

6. 1-in-3 Success Rate

Whilst scoring is absolute, unofficial surveys have indicated that a fairly regular PST pass rate at around 33% . Most of those candidates who fail do so because they didn't work efficiently enough and/or failed to manage their time correctly , rather than because they lacked any cognitive capacity. One of the major causes of failure is actually candidates not allocating sufficient time at the end of the test to fill in the PST answer sheet!

The takeaway here is that the McKinsey Problem Solving Test should be treated more as a skill-test to be practiced for , rather than as some assessment of raw intelligence you can simply walk in and expect to pass if you are clever enough. You need to understand the relevant time saving methods and strategies to approach the test as a whole if you want to pass and eventually land your job at McKinsey.

7. McKinsey PST vs GMAT

If you have never sat the GMAT, you can skip this point. Many candidates who have previously prepped for and sat the GMAT suffer from a false assumption that the PST will be the same test by a different name - that there are very few diffences in the McKinsey PST vs GMAT. However, despite the similar format, this is not the case.

There is some overlap - for instance, you will need to have strong math for both. However, the PST requires a totally different, less academic style of math , where you need to be able to estimate, prioritise calculations and know how to take the right shortcuts (our mental math article is relevant on the differences here). Generally, the PST and GMAT serve different purposes and are tailored to those purposes in different ways. As such, you need to treat the PST as its own beast and prep for it accordingly.

An AI-based, bespoke preparation plan

As we have noted, the McKinsey PST is partitioned into three business cases, with eight to ten questions for each case. As with a real project, or indeed a case interview, you will be presented with data in charts or tables as well as with descriptive text . Typically, each individual piece of information will be followed by two to three questions referring to that information specifically.

PST questions can be split into six groups which can be expected to account for different fractions of the test. Let's take an in-depth look at each:

1. ~35% - Reading Facts

Reading facts PST questions test your ability to extract and elaborate data from graphs and tables. These are the most common question type, and you can expect them to make up around 35% of your PST.

Typical Formats

• Which of the following values is the best estimate of ...?
• Which of the following statements is valid, based on the data ...?
• What is the current ranking of options 1 to 5?
• Which of the following values is the best estimate of ABC revenue in Year 4?
• To the nearest tenth percentage point, what is the difference between Italy’s and Spain’s respective average annual agriculture sector growths due to fertilizing over the last 10 years?

Worked Example

The table below shows the sales development of the Topstar business unit across the main markets.

Which of these markets showed the fastest sales development (in percentage terms) from 2009-2012?

As you can see, two minutes is not a lot of time to solve this! Let's have a look at an efficient method to let you get to the answer as quickly as possible. The steps identified here generalise to other reading facts questions.

Read the question - pretty straightforward in this case, as you are asked to identify the country with the highest growth rate.

Read the answers - there are four countries to be compared.

Go back to the table - compare the growth rate, between only 2009 and 2012, for those four countries. Simplify figures as much as possible and run precise calculations only if you find out that the difference between two countries growth rates is not large enough to guarantee a reliable result through simplification.

Define the calculation - you need to work out the form of the equation you would need to solve in order to calculate market growth. This will be:

Now you can put the equation to work. Start with the first option - the US. Approximately, US growth will be:

From simple inspection, this is obviously much higher than 50% - it is around 70%.

You can then move on to other countries using this US value as a benchmark and comparing them solely to that value. Germany's growth will be:

This is very close to 50% - so obviously less that the ~70% of the US. You can cross out Germany as an incorrect answer. Note that, if the value for Germany had been higher than the US one, you would have crossed out the US and gone forward using the German growth value as your benchmark.

For Italy, the calculation will be:

1/3 is (roughly) 33%, so obviously lower than 50% and certainly lower than the US. Cross out Italy!

For Japan, growth was from 50 to 58, so there is no need to make any calculations in order to rule it out.

This leaves he US (option A) as the correct answer.

Tips and Tricks

There are a couple of tricks you can employ to get through Reading Facts questions more efficiently:

1. Begin with an end in mind

Before performing any calculations, be clear on which formula/equation you need to use. This is crucial as there is no time for trial and error in the PST. Spending just a few more seconds nailing down the exact formula you need at the beginning will pay dividends by saving you much more time in the calculation phase.

2. Minimise the number of calculations

When going through your solutions, you will be surprised by how many calculations can be avoided or approximated mentally. The fundamental question you should ask yourself before performing any calculation is "does this affect the answer?". This might sound a little odd, but it is a habit which you must form to become quick enough to pass the McKinsey PST. Here are a couple of examples where you can "work clever" to avoid redundant calculations:

The Anchoring Technique

This the technique we used in the example above. When looking for the highest value amongst several possible answers, run calculations for the first answer and use that value as a threshold value as you work through the others. If other answers look immediately wrong, do not perform any further calculations - just as we did with Japan, above. (Generally, you can almost think of this as a less probabilistic version of the solution to the secretary problem .)

The Selection Technique

Here, you pre-select only the calculations which are essential to identifying the answer. For example, the question below asks you to rank the effectiveness of 5 solutions:

• 1, 2, 4, 3, 5
• 1, 2, 3, 4, 5
• 1, 3, 2, 4, 5
• 1, 3, 2, 5, 4

Calculating whether solution A is the most effective is a complete waste of your time – it is the least answer-changing analysis. Instead, calculate which is the most effective between solutions B and C, working from there.

3. Master quick percentage calculations

Growth rates and percentages are ubiquitous in the McKinsey Problem Solving Test. In particular, it is pretty much a certainty that you will be asked to calculate growth rates over multiple time periods. This is theoretically feasible by hand, but extremely time-consuming. For example, say the revenues of a given company are growing at 5% per year for four years. In order to get a precise result, you would need to calculate the four year compound growth rate as follows:

Quite simply, regardless of how quick you are at math, you absolutely do not have the time to go through this whole calculation. It would almost certainly take more than two minutes just for this step, which might not actually be enough to answer the whole question (usually, calculating such a percentage will only be a subset of a question).

Instead, you can arrive at an approximate but good-enough value for this growth rate by using a straightforward shortcut. To do this, we simply multiply the growth rate by the number of years it will apply for, estimating the compound growth rate. Here, this will be 5% x 4 years = 20%.

There are a couple of caveats here which will already be obvious to more mathematically inclined readers:

• With positive growth rates, the compound rate will be underestimated. Above, we estimate 20%, but the real figure is actually 21%. Conversely, with negative growth rates, this method will overestimate the compound value.
• The greater the magnitude of the annual growth rate and the greater the number of years for which it is applied, the less precise this technique becomes. For instance, five years of compound growth at 5% per annum yields a 27% compound growth rate, whilst this shortcut would give us a value of 25%.

2. ~18% - Root-Cause Reasons

Root-Cause Reason PST questions test your ability to identify the causes underlying business problems. These questions begin from some fact about a business, which must be explained. The candidate is then given a list of putative explanations for this fact. However, only one of this list of suggestions is actually a logically valid explanation of the phenomenon in question. The candidate must identify which this is.

• Which of the following reasons, if TRUE, is most likely to be the reason for the drop in house prices in year two?
• Which of the following, if true, LEAST explains the data for Slovenia and the Czech Republic in Exhibit 2?
• Which of the following reasons, if TRUE, best explains the reason why the CEO wants to proceed to ...?
• Which of the following does NOT help to explain why ...?
• Which of the following, if TRUE, would best challenge the sales manager's decision?

Zapclothing is a global fashion retailer, traditionally catering primarily to teenage girls and with shops across Europe. Five years ago, the senior management at Zapclothing decided to embark up an move upmarket, with the aim of catering to a slightly older and more affluent customer base.

Leading French and Italian designers were hired to create unique and exclusive lines for Zapclothing, whilst prices were raised across the entire product line by 20-30%. A series of events were held in all major global cities in order to launch the new incarnation of Zapclothing as a brand with a more sophisticated, upscale image.

Initially, this mid-market transition boosted profit margins without altering sales volumes. However, one year later, the company has found itself with plummeting revenues and a decreased profit margin. In order to return profits to their previous higher levels, the marketing manager has proposed a permanent price reduction of 10% across all lines.

Which of the following facts, if true, would best challenge the sales manager's price reduction proposal?

• Over the last year, due to higher commodity costs, prices increased by 15% on average for the whole fashion industry
• Consumers consistently quoted price among the top three quality attributes for mid and high-level fashion brands in surveys over the last 5 years
• In a recent survey, over 80% of the existing customer base claimed that they would still buy more than 50% of their clothes from Zapclothing, regardless of price
• Females aged 20-30 consider price among the top three criteria for deciding whether to make a purchase
• Read the question carefully, making sure that you understand what is being asked.
• Scan the answers and underline the key words in the text. Don't spend any more than 10 seconds on this step - the intention is simply to make you quicker in finding the relevant parts of the introductory paragraph.
• Think carefully about how this proposal can be challenged. The most effective challenge is necessarily that acting based on this proposal would not help to solve the company's problems - in our example, restoring high revenues. If this is the case, then the proposal does not correctly identify the cause of the focal issue.
• Go back to the answers, crossing out the incorrect ones. Let's see how we assess the four answers in our example:
• Not relevant . The fact that prices increases increased on average by 15% for the whole industry does not tell us whether a decision to reduce prices would bring in additional revenue from existing and/or new customers. FALSE
• If consumers consider a higher price to be a signal for superior for mid and high-level fashion brands (where Zapclothing hs positioned itself), reducing prices could have a neutral or even counterproductive effect on revenue growth. TRUE
• Not relevant . This statement is only relevant to revenue derived from existing customers. Even if the behaviour of current customers was entirely unchanged, revenues could still be grown by tapping the pool of potential new customers. The information provided is incomplete and would not be sufficient to challenge the sales manager's proposal. FALSE
• Opposite Direction. This fact would not challenge the sales manager's idea, but reinforce it. FALSE

Practice makes perfect

Correct answers in Root-Cause Reason questions will always have two elements in common:

• Relevance - they have a significant effect on the target stated in the introductory paragraph
• Correct Directionality - their effect on the target should be going in the direction required by the question

As we have already observed in the example above, there are generally three kinds of answer in Root Cause Reasons:

1. Not Relevant

These are answers which have no, or only limited, effect on the proposal in question (as with answers A and C in the example above). By identifying the kind of fact which would have some bearing on the proposal, you will be able to quickly pick out answers which simply have no influence on the relevant issue.

Note here that you should always be careful not to assume anything which is not explicitly stated. Often, there can be a temptation to think beyond what is actually on the page. For example, when you are assessing C above, some candidates might assume that the preferences of existing customers will also be representative of potential new customers as well, or perhaps that the focus on existing customers indicates their particular importance to the problem. This would make C seem more relevant to the sales manager's proposal and would thus then ultimately lead you into error. PST questions are a test of your ability to read closely and think logically - not of your imagination!

2. Relevant, But With the Wrong Directionality

These answers affect the proposal in question, but with the effect going in the opposite direction to what you are looking for. For example, D above actually reinforces the sales manager's proposal rather than challenging it.

One of the most common errors in Root-Cause Reason questions is selecting answers which are relevant, but with the opposite directionality to what the questions is asking for. As such, you must always keep in mind what the question has actually requested and the kind of answer which fulfils that request.

3. Relevant and With the Correct Directionality

These are answers which significantly affect the proposal in the correct direction, according to the parameters set by the question.

3. ~17% - Fact-Based Conclusions

Fact-Based Conclusion PST questions test your ability to draw logical conclusions from a collection of facts. These questions can manifest the greatest degree of variation of all types, and can range from something relatively similar to a Reading Facts question to a requirement for you to make some very tough inferences from rather vague introductory text.

• Which of the following statements can be concluded from ...?
• Based on the data on table ..., which of the following statements is a valid conclusion?

Pharcom is a global pharmaceutical company engaged in the development of small molecule drugs. Your team has been called by the Head of R&D to help him pre-select the drugs that are most likely to reach patenting and commercialization. He claims that, on average, 12% of researched drugs are cleared to be marketed, while the remainder are dismissed either during the R&D process or at final certification. Currently the average total expense for every drug in development is £12m and the full trial and certification lasts for 10 years for the drugs going through the full process. The research and development process of the drugs is constituted by the following steps:

• Trial 1 : Laboratory trial to test the effect of the active ingredients. The trial costs £3.5m and lasts for 2 years.
• Trial 2 : Laboratory trial to test the impact of side effects. The trial costs £4m and lasts for 1.5 years.
• Trial 3 : Animal testing to evaluate bacteria resistance. The trial costs £4.5m and lasts for 4.5 years.
• Final certification by Food and Drug Administration . Filing costs £4.5m. Certification lasts for 2.5 years.

Which of the following statements can be concluded based on the information above?

• Most drugs complete the entire research, development and certification process.
• Before being either approved or dismissed, drugs remain in the development and certification process for an average of 7.5 years.
• Reducing by 50% the length of Trial 2 and Trial 3 would reduce the total cost of the Pharcom research and development process by £4.25m.
• Over 50% of the drugs reach Trial 3 stage in the research and development process.
• Read the question carefully and make sure you understand what is being asked.
• Read the answers and underline key words in the introductory text . Identify the specific graph or portion of the introductory paragraph each answer refers to.
• Start with the numerical answers . These are often the clearest and most straightforward to solve. Generally, go back and forth between the answers and the introductory text and any figures. To identify the correct answers, it helps to consider whether the opposite of the statement would be true.
• Since the average cost per drug is £12m, we can quickly establish that the average time in the pipeline is 8 years - at the end of Trial 3 - as this is the point where £12m of expenses have been accrued (£3.5m from Trail 1, £1.5m from Trial 2 and £4.5m from Trial 3). Let's take the hypothetical case where 50% of drugs stay in the pipeline for 7.5 years and 50% for 8.5 years. In this case, no drugs at all complete the pipeline, but the mean time spent in that pipeline would be 8 years. Since cases where no drugs at all are approved are compatible with the information we have been given, we certainly can't safely infer that most drugs are approved. As such, we can rule out A. FALSE

As we have just established, the average time drugs are in the process before being dismissed or certified is 8 years (as the average cost of £12m is accrued by the end of Trial 3). Obviously, then, the value here of 7.5 years in wrong. FALSE

We simply don't have the information which would be required to know if this statement is true or not. It might be tempting to imagine here that if we halve the time for a trial, we halve the duration of a trial, then we halve its cost - this would indeed yield a value of £4.25m. However, we have no justification for the assumption here that cost varies with time in a purely linear fashion. In more usual business terminology, we cannot assume that the costs associated with trials are purely variable, so that halving the trial's magnitude halves costs. There might be fixed costs which are incurred regardless of trial length - perhaps administrative costs in setting up the trial or the cost of buying equipment, recruiting staff etc. Clearly we cannot state C to be true based on the information we have. FALSE

Trial 3 is reached after 3.5 years - that is, the total duration of Trials 1 and 2. As above, the average time each drug spends in the pipeline is 8 years. Now, mathematically, it is entirely possible for mean and modal values to diverge significantly. This is to say, it is possible for more than half of drugs to be in the pipeline for much less than our 8 year average value as long as there are some drugs staying in the pipleline for much longer so as to balance them out.

Let's take another hypothetical extreme case. We could keep a mean of 8 years but approach the case where the majority of drugs did not make it to Trial 3 by assuming that 50% of drugs are rejected just slightly before the 3.5 year mark. To keep a mean of 8 years, then, the other 50% of drugs would need to remain in the pipleine for 12.5 years. However, the maximum length of the process before certification is 10 years. As such, we know that more than 50% of drugs must be in the pipeline for more than 3.5 years - and thus make it into Trial 3. TRUE

In dealing with Fact-Based Conclusion PST questions, there are three types of answer which you might encounter:

1. False Conclusions

Some answers might simply be false or wrong. Even if they seem logically sound, the outcome might be reversed or otherwise wrong.

2. True Conclusions

Answers which both have sound logic and draw the correct conclusion.

3. Unproven Conclusions

The logic here might be correct and the conclusion might well seem reasonable. However, they cannot be fully supported by the facts which have been presented to you in the introductory text and/or graph.

How to discern false answers from true ones

Telling apart true and false answers can be both challenging and time consuming. In particular, some answers will require to mentally estimate a whole set of values for which statements or relationships might hold. Here are two steps which might prove useful in assessing a statement:

Can the opposite also be true?

Always consider whether the opposite of what has been stated can actually be disputed. Candidates typically fail to ask themselves this question, but it can be highly revealing. You will be surprised at how much of a difference asking this simple question can make.

Consider the extremes

Answers should always hold true - not just most of the time. If an answer is not always true, it is not valid. A variant of this method we used above to verify answer D above - we considered the extreme values which would could notionally maintain the average of 8 years, but then ruled these out as impossible within the bounds of the question.

4. ~15% - Word Problems

Word Problem PST questions require you to solve business problems by combining information across sources. In other kinds of question in the Problem Solving Test, you will find all the relevant data from exhibits or introductory paragraphs. However, in Word Problems, part of the challenge is that the relevant data is spread between the question itself as well as the introductory text or exhibits. If you have taken the GMAT, you will find that word problems are the closest of the PST question types to what you will find in the GMAT.

• Assuming that a machine costs $2m, how many years will it take for the firm to break even from its investment?
• If an average employee is paid 12 hours per month, which of the following formulae accurately calculates the average number of items handled per employee, per month?
• If employees’ salaries are increased by 20%, what is the increase in productivity required to break even?
• Assuming that the economy keeps on growing at 2% per year for the upcoming 10 years, which of the following equations best approximates the decrease in the debt/GDP ratio?

Ardito, a leading fast fashion retailer, has 79,000 employees spread over 3,350 branches. Maison operates on approximately 25 FTE employees per retail branch. Approximately, how many more branches than Ardito should Maison have to sell as many items in menswear as Ardito?

• Carefully read and understand the Word Problem
• Go through the answers to assess the level of precision which you are going to need in your calculations. Here, since the answers are quite far apart, you will be able to estimate rather than calculated precisely.

First, consider what has to be kept constant

This yields:

At this point, we have two possible solutions. The first is as follows:

The final answer will be between 1000 and 2000. Thus, we know the answer is B. However, note how many steps and how many calculations were involved here - you almost certainly won't be able to get this done in under two minutes!

The second solution takes care of this problem and is as follows:

Here, you simply plug numbers from the answer options into the equation and see which would make that equation work. This method is by far the more efficient way to solve this kind of problem.

Quickly, we can see that 1,700 is the only result fitting the equation. Thus, the answer is B. Note how much faster this was than the first solution.

5. ~10% - Client Interpretation

Client Interpretation questions focus on understanding project requirements and the analyses which will be necessary to tackle the client's concerns. In consulting projects, you will engage every day with various stakeholders from the client company . Fundamentally, client interpretation questions are about understanding:

• What the client says that can have an impact on defining the scope of your project
• What the client implies about given choice or strategy
• Which are the best analysis decisions to take in order to fit the client’s needs
• Which of the following best summarizes the CEO’s concerns?
• Which of the following statements best describes the thoughts of the CEO regarding...?
• Based on the opinion of the Head of Department, which of the following statements is/are valid?
• Which of the following statements best describes the CEO’s aims for the McKinsey study?
• Which of the following analyses would be LEAST useful to address the CEO’s concerns?
• Given the aims of the CEO, what would be the LEAST relevant question for the team to answer?

Soul is a leading fashion retailer, selling clothing, shoes, make-up and accessories. It has around 400 shops worldwide, of which 200 are in the UK. Soul operates through a franchising model, where shops are run by private independent companies who pay a royalty fee to Soul. In exchange, Soul designs the shops and supplies them with new clothing lines, manages branding and advertising, sets promotions and provides shop-owners with guidance on all standard operating procedures for running the shops. This strategy enabled Soul to dramatically grow in scale, boosting shop opening and customer base. However, customer numbers have recently plateaued, resulting in slower sales and profit growth.

The CEO of Soul has engaged your team to help understand whether the recent changes in revenue and profitability trends are related to unsatisfactory shopping experience. He is convinced that the recent growth in scale came at the expense of a consistent shopping experience across all locations. He tells the team “I am sure that the responsibility of the current slowdown lies in poor delivery by the shop owners. I recently visited five shops in different countries and three of them did not fully apply our policies ensuring consistency in shop layout and pricing policies. This is disorienting our customers and pushing them to seek out our increasingly aggressive competitors”.

Which one of the following answers BEST describes why the CEO has engaged your team?

• He wants help in implementing a coherent and consistent brand image and shopping experience across all shops.
• He wants to identify the causes of the inconsistent shopping experience across shops in different countries.
• He wants to validate his hypothesis that an inconsistent shopping experience in different stores led to declining revenues and profitability.
• He wants to overhaul the set of policies and standard operating procedures imposed to shops in order to guarantee a consistent shopping experience.

Here, two aspect of the established method from above take on increased significance over the others:

• Read the question . This is generally pretty straightforward, and simply enquires as to the client's reason for engaging McKinsey.
• Scan the answers and underline key words. Do not spend any more than 10 seconds on this step. As before, the purpose is simply to facilitate finding relevant pieces of information later.
• Go back to the text and quickly jump to the relevant part . More than 50% if the paragraph is of little or no use. Precisely reading the essential sentence will be enough to answer the question.
• This answer may be true, but it does not capture the purpose behind engaging your team. The CEO did not call your team to advise him on branding or design, but because he wants to understand the causes of his company's downturn. FALSE
• The reason for engaging your team is not to understand the causes of the poor shopping experience, but the causes of the downturn - these are not necessarily going to be the same thing. FALSE
• The purpose of this engagement is finding out whether inconsistent shopping experiences across stores led to the current downturn. TRUE
• Again, this answer could be true, but it is not the reason for engaging your team. The CEO did not bring you in to redesign policies, but to understand the causes of the downturn. FALSE
• Highlight the keywords in all answers . Prioritising the right words and sentences will save you a great deal of time.
• Cross out incorrect answers . Often, one or more answers will be clearly incorrect, whilst two or more will appear to be correct or almost correct. Cross out the obviously wrong answers before returning to the introductory text to pick out which of the "almost right" answers is actually correct.
• Beware of the "sensible answer trap" . Sometimes, answers contain implications which look rational and sensible. However, be very careful about making assumptions beyond the information you have been supplied. No matter how reasonable a statement might seem, if the client has not actually said something to that effect, that statement is simply not valid.

6. ~5% - Formulae

Formulae PST questions ask you to express a quantitative word problem as a symbolic formula. This will test you capacity for abstraction by challenging your abilities to extrapolate from data, break down problems and identify drivers and directions of causality.

Which of the following formulae calculates the share of non-performing loans out of total loans?

Typical format

Which of the following formulae best approximates ...?

Forman Fisheries is engaged in packaging shrimp and other fish. Shrimp are graded from A to D depending upon their size and taste. Below are some key productivity indicators for Forman Fisheries' shrimp packaging activities:

Assuming that all boxes contain the same quantity of shrimps, which of the following formulae best approximates how many boxes of non-grade A shrimps were packed in the last month?

• Homogenise your units of measurement . Since we are looking at a number over one month, wherever we will need the quantity of total boxes c, we will divide it 12, since it is an annual indicator.

Break down the problem into smaller steps . This should help you get to the relevant ratio more quickly. In this case:

Identify how to solve for each of the elements of this equation:

Simplifying:

And thus the correct answer is answer D.

All you need to pass the McKinsey PST

Sometimes, answer formulae are presented with various simplifications which can make it time consuming to figure out whether they are correct. However, formula questions are about extrapolating a formula which should work with any value for each variable.

A trick to double check your results is to replace some of the values in the table with simpler ones, come up with a solution and then plugging these simple values into the formulae to see if they produce that same solution.

For example, in this case, assume that:

Grade A shrimp share of total shrimp (b) = 10%

Total boxes per year (c) = 1200

Therefore, boxes per month = c / 12 = 100 per month

Since all boxes are the same size, non-grade A boxes will be:

Now that you know that a correct equation will generate a result of 9, you can plug the numbers above into each of the options and check which produces 9 as an answer. This trick works especially well when the formulae involve high degrees of simplification.

Each PST question type tests a subset of the skills that are useful in consulting. It is worth remembering that there is only so far practicing PST example questions alone will get you if you have not taken the time to develop these skills. Think about a kid trying to learn math - they can spend hours looking at all the sums they want, but they won't get very far if they haven't learnt to add yet!

Since these are the exact same skills that are assessed in your case interview and via your resume and cover letter , it makes sense to learn exactly what they are and what is required of you. It is worth noting that this is the same overall consulting skillset is the same one we teach in our Case Academy - our approach is consistent across the whole recruiting process.

So, what are these skills?

Just like doctors, consultants focus on identifying and treating the underlying causes of a problem. When you address a problem, you shouldn't ever stop at the superficial level of observable symptoms, but must dig deeper and find the real issue underlying what you are dealing with.

For example, imagine a doctor who has a patient complaining of persistent headaches. A good doctor is not just going to keep dishing out painkillers, but are going to want to establish what is causing the pain. It might be, say, that the headaches are caused by poor eyesight. If so, the patient will be dispatched to the optician to get some glasses to solve the problem more permanently.

Consultants always anchor their diagnoses and recommendations on data and analysis - never on opinions or hunches! This is called a fact-based approach.

In order to be able to correctly answer all the PST questions (and fill in that answer sheet!) within the time limit, you will need to be able to prioritise important data and calculations, effectively deal with uncertainly and generally find a good compromise between accuracy and speed. This includes the ability to select salient information from large volumes of text and to deal with ambiguity within that text. Once they are on top of the raw facts of what is happening, consultants will always then extract the salient implications - or the "so-what" - of the situation, rather than just re-describing the same data.

Most PST questions will require you to perform some kind of calculation. Since you are not permitted to use a calculator or similar, you are going to have to be very comfortable with mental math. In particular, you will have to be able to make estimates very quickly. We have an article on mental math for consulting , as well as a free practice tool , which will be a great starting point to sharpening up your skills and learning the various shortcuts to make your calculations faster.

To pass the McKinsey PST as well as to get through your case interview , you are going to need to be able to quickly and reliably infer relevant information from complex graphs and tables. This information will be used to find root causes, draw fact-based conclusions or as the starting point for mental math problems.

The McKinsey PST doesn't require super-complex math, and certainly nothing beyond high school level. McKinsey PST formulas will always be realtively simple ones and you will not have to muster any complex algebra. However, what will be different from a high school math question is that it will be much less clear as to how you should be approaching problems. You will often have to set up equations by extracting one or two salient relationships from a large amount of otherwise irrelevant information. Identifying what is relevant will be the real challenge rather than the relatively simple math. Subsequently manipulating these formulae will come relatively easily to many of you. However, the time constraints and lack of a calculator in the PST will necessitate even the most mathematically gifted to be somewhat strategic in terms of how they chose to solve problems. You will need to avoid analyses that will take too long and which you cannot complete without a calculating aid.

Each of the skills above will be tested in different kinds of question. Be sure to keep a note of which skill in particular has let you down each time you have a problem with a PST question. After a few questions, you should have an idea of where your systematic weak points are and thus where you should focus your efforts to improve via building stronger skills. If your mental math is constantly an issue, go to our mental math article . If you are struggling with identifying root causes, our article on identifying the problem in case studies would be a great place to start.

The important point is that you won't get really good at PST questions simply by doing PST questions - you need to build the right skills! It is worth noting here that our Case Academy teaches precisely the consulting skillset as the McKinsey PST requires (usually case prep systems just teach question-specific frameworks, but we focus on fundamental skills). As such, working through the Academy will not just prep you for case interviews, but also build the full skillset required for the PST. If you are intent on going all the way through the selection process with McKinsey math prep and other aspects of skill building only need to be done once. Two birds with one stone - an efficient use of time!

By now, you will have a good idea of what the McKinsey Problem Solving Test is, what the questions look like and the skills it is assessing. The categorisation of different question types and the methods and tips we have discussed for each already give you the building blocks for a solid prep. However, to make your preparation both as effective and time efficient as possible, you should really begin by making a plan to provide some structure. This will make sure that you don't miss out any key elements and also that you distribute your time sensibly.

As you will have realised by now, the PST is difficult - especially because of the acute time constraints. Having made a plan and diligently practiced all your skills might not actually be enough to pass. You also need to consider your strategy for tackling the test optimally. We have already given a few tips on this, peppered throughout the sections above, but there are also several points on general test management which you will need to know about.

Let's look in more depth both at how you should plan your prep and at your strategy for approaching the McKinsey Problem Solving Test:

Preparation plan

Don't be fooled by those who repeat the old mantra "practice, practice, practice". While practicing is very useful, relying entirely on "brute force" practice with PST sample questions can be remarkably ineffective and a way to set yourself up for failure.

A more sophisticated, more effective prep plan will be made up of the following elements:

1. Skill Building

You need to build your general consulting skillset to be able to reliably perform well on real PST questions. This will never be wasted time, as you will need exactly the same skills in your case interview - and indeed for when you (hopefully) start the job! In particular, given nobody will be starting entirely from scratch on these skills, you need to identify and work on your areas for improvement. As mentioned above, you should take note of where you are underperforming and address your attention there. In particular, you will want to focus on the following:

Numerical Agility

Being able to perform mental math quickly is arguably the single most essential skill required to pass the McKinsey Problem Solving Test. In particular, you will find that the need to make rapid estimates will recur constantly in PST questions. This includes understanding the appropriate degree of approximation as well as getting through calculations quickly. The mental math video in the Efficiency Tools section of the MCC Academy will provide you with all the fundamentals and all the tricks and methods you need to be genuinely quick with numbers and is a great way to get to grips with everything quickly and without missing anything out.

Reading Charts and Solving Problems

Again, the ability to extract information from diagrams and set up and solve mathematical problems are critical to being able to deal with many PST problems. Indeed, the numbers and equations for your mental math must come from somewhere! You will have to read charts in the McKinsey PST and will have to do so under severe time pressure. Similarly, various types of PST question will test your ability to work through problems in an efficient fashion. Our mental math article deals with reading charts. We also cover this whole area in great detail in the MCC Academy course and also include extensive drills in our Beyond Test Ready package.

Identify root causes and draw fact-based conclusions:

Being able to wade through information and identify fundamental causal drivers and synthesise findings into takeaways fully supported by the data are key consulting skills and one which your PST will test across multiple questions. To help you prepare as thoroughly as possible for these, we provide 10 specific sample questions on these areas in each of our Test Ready and Beyond Test Ready packages.

2. Refining

To optimise your performance on the PST, your prep should always include a blend of practice and skill building. Your first step should be to try a practice PST to see where exactly your weak spots are. You should then work on these particular skills using other resources, (such as the articles on this site and the lessons in MCC Academy). You can then return to another practice PST to see how you have progressed and where you should then focus on your next bout of skill building. You should then iterate this process until you are ready to take the PST for real.

It is worth noting that this method also makes sense at a more pragmatic level, as there is only a limited supply of sample PST test papers available to practice with online. This iterative approach, then, has the added benefit of letting you make best possible use of the scarce resource that is PST examples. The skill-specific questions provided in our Beyond Test Ready package also help deal with this lack of practice material and are invaluable in the skill building process.

3. Simulation

Once you have practiced enough, it will be time to step up to simulating the real PST more fully. There is a temptation to skip what might seem like the "theatrics" of a full simulation. However, you cannot just assume that it will all be fine on the day! This is the same rationale for why your high school most likely had you sit full mock exams before important assessments, rather than just rely on class tests etc.

You should replicate the PST test environment as closely as possible. Print out your sample PST test paper, staple it and print out your answer sheet. Find a quiet room and do the test strictly in the allotted time and without a calculator or any other such "contraband". You might feel a bit silly doing all of this, but it really is worth it. Sticking exactly to the rules is the only way to really practice your PST test strategy. Even relatively small things like becoming accustomed to keeping your notes entirely in the booklet and actually filling in the answer sheet at the end will save you precious time in the real PST.

4. Keeping an Error Log

When you run through a practice test with a mark scheme, everything will seem very easy. "Oh, of course, that's exactly what I should have done..." Fast-forward couple of weeks later, though, and you will find yourself staring at a PST question with precisely the same structure, but with no idea of how to solve it.

This is precisely why you need to keep an error log. You might already be familiar with error logs from GMAT prep, but we recommend you extend the practice here. For the uninitiated, an error log is a continuous method of analysing practice problems to identify WHY you answered them incorrectly. In your error log, you should be keeping track of your mistakes and of what you found hardest (even if you got there in the end). As well as using this information to inform where your energy is focussed in skill building, you should also be running through your log frequently to ingrain the lessons you have learnt and generally consolidate your technique.

There is no single correct format for your error log. Some will prefer very organised, detailed logs, whereas others will prefer a more old-fashioned paper record. Really, you should chose whichever method you personally find most convenient, as what is most important is that you actually make consistent use of the log over time.

Whichever way you chose to set out your error log, though, we recommend that each entry should contain the following information.

• Question type - as per our categorisation above.
• Reason why you found the question difficult - you might have taken too long to answer or not been able
• Question and answer choices - record what the question actually was
• Proposed solution - work out the method which you should ideally have used to solve the question - that is, whichever solution you find quickest and most effective given your own abilities.
• Key takeaways - what you should learn in order to answer this kind of question more efficiently. For example, you might need to learn how to simplify fractions more rapidly or to improve your quick reading skills.

The "key takeaways" in your error log are what will guide the direction of your prep for the next few days, before you test your abilities again in the iterative manner we described above.

Whilst error logs help to marry skill building and practice - just as any optimised PST prep absolutely must - in forming part of the iterative method we describe above, error logs also take on a more pragmatic function. Whilst the McKinsey problem solving test sample itself is excellent and we at MyConsultingCoach have invested significant time and money into creating and perfecting additional content, this still ultimately adds up to a finite amount of practice material. This unavoidable constraint means that you must work sensibly to squeeze the greatest amount of utility out of what is available.

The amount of practice you are able to do will always be the ultimate bottleneck in any PST prep. Experiencing different questions will both let you take the iterative process of identifying and working on problems areas further, but will also make you less likely to be surprised by something entirely new in the real PST. Access to extra practice material is thus a major driver of increased performance on test day and - ultimately - landing a job. You will find practice tests at the bottom of this page.

PST guide and practice test

Test strategy.

Most McKinsey PST questions are not actually all that conceptually demanding. The real difficulty derives from the extreme time constraint. As we noted above, given three hours with the same PST test paper, everyone would pass. In practice, then, the successful candidates - who go on to get interviews and jobs - might not actually be the most clever or able, but will often simply be those who have been able to manage their time most effectively.

Obviously, we have already explained a whole host of time saving methods for use in different kinds of questions above. Building up your skills will also help get through questions faster - improving your mental math in particular will see significant reductions in your time taken per question.

However, to pass you must also consider your time usage not just individual questions, but for the problems solving test as a whole. In this section, then, we will go over both an overall test time strategy and a consistent strategy to answer PST questions:

1. Test Time Strategy

PST question difficulty varies quite significantly. Some questions are really quite straightforward to the point of being "easy". Others are seemingly impossible. Unfortunately, you can't expect to get a paper with only the easy ones (if only, eh!), but will have a mix of different difficulties across your 26 questions.

To start to optimise your approach, you should combine this realisation as to varying question difficultly with the following two facts we alluded to near the beginning of this article:

• All questions are worth the same
• There is no penalty for wrong answers (there is no "negative marking")

Now (as we keep mentioning), you will need to leave at least five minutes at the end to fill in the answer sheet. Of the remaining time, you can allocate two minutes to each of your 26 questions (the maths geniuses amongst you will note that that leaves 3 minutes spare, but you can be assured that they will disappear whether you like it or not).

Given that all the questions are worth the same marks, you simply cannot allow yourself to become bogged down on one particularly tough PST question and leave yourself without time to answer two easy ones. To avoid this, you should keep track of how far through the test you are relative to how much time has elapsed - that is, make sure you are actually getting through questions at a rate of one every two minutes. For instance, if you are 10 minutes in, you should at least be just finishing question five.

If you realise that you've fallen behind because you are stuck on a very hard question, you should not devote more time to it. Simply circle that question and what seem like the two or three most likely answers from your analysis so far.

If you get to the end of the test and have some time left besides that required to fill in the answer sheet, you can go back and look at the question again. Often, coming back and looking with fresh eyes will break you out of an analytic rut. However, if you still simply can't make head nor tail of the question, or if you end up without any more time to devote to it, you should simply pick one of your circled likely-answers at random and put that down on the answer sheet.

Don't feel too bad about this - the PST cuttoff pass mark is around 70%, so you don't need to have gotten everything right. Who knows, your best guess might end up to be the right one anyway! Even if you picked an answer at random it has a 25% chance of being right. An educated guess should have somewhat better odds than that.

2. Question Strategy

We have already said quite a bit above about how you should approach individual kinds of question. However, we can also make some helpful remarks about how you should be approaching each question more generally.

The first fact to note is that whenever you first sit down to a practice test, you will realise that a minimum of 20% of your mistakes are simply due to mis-read questions. Indeed, a great deal of excellent candidates will fail their PST ultimately because they failed to read a critical number of questions properly. It seems absurd when one considers how accomplished the average McKinsey applicant is, that they are effectively let down by their literacy! However, it is true nonetheless and you can see why we so consistently instructed you to carefully read all the different kinds of questions as we ran through them!

One of the main things the McKinsey PST assesses is your ability to deal with "information overload". This happens when you are presented with large volumes of text and/or quantitative data, where only some of it is relevant to the question you have been asked and you must work out which.

This actually simulates a some of the real demands placed on McKinsey's consultants, who will be confronted with all the complexity of the client firm's operation as well as the market it operates in and how it relates to firms up and downstream in its value chain. From here, the consultant must work out which aspects of the operation - and thus which portions of information - are actually salient to the client's question.

How you should proceeds next depends upon whether you have to chose between qualitative or quantitative answers:

Qualitative

Here, you should pursue an iterative method of going back and forth between the questions and the text, eliminating (and then physically crossing out to prevent any future confusion) incorrect answers one-by-one. This is fundamentally a test of your linguistic reasoning, though we have provided various hints and helpful techniques for different kinds of question above. Of course, the most fundamental advice we can give is to read PST questions carefully, but you can also do things like considering what would be true if the exact opposite of the focal statement were true.

Quantitative

You have a couple of options when dealing with quantitative answers, depending upon the specific nature of the question you have been asked. As such, you can chose to do either of the following:

The "Conventional" approach

Here, you simply identify the relevant data and solve the problem directly. Run through all the calculations on paper and then see which of the multiple choice answers matches the solution you generate. This is how you are probably accustomed to tackling problems from your education and will also be the best way to approach many of the questions in your PST

Working "Backwards"

Often, though, you will not have enough time to work through all the calculations required to answer a particular question via the conventional approach. In such cases, you will need to take a more strategic approach. We can do this by effectively working backwards from the answers. This is not as strange a method as it might sound - you simply need to build a framework of the relevant calculation and plug in the suggested answers until you find one that works.

Using this method can save time on multiple counts as, usually once you have found an answer that works, you don't have to take the time out to work through the other options (of course, in an ideal world you would indeed work through the other answers as a means to check for any mistakes on your own part, but time is precious in the PST and "done is better than perfect").

Having read this far, you should be well equipped to start preparing to take the McKinsey Problem Solving Test. The first step is to take one or two practice PST test papers . This will let you get a feel for what the tests are actually like generally, but - crucially - will also allow you to start your prep off with an idea of which skills you need to work on, as per our iterative method above.

You can find everything you need on this website or on the McKinsey website. Specifically, here are some PST samples to get you started:

• MyConsultingCoach McKinsey PST (free)
• McKinsey PST A (by McKinsey)
• McKinsey PST B (by McKinsey)
• McKinsey PST C (by McKinsey)
• McKinsey PST 2011 version (by McKinsey)
• McKinsey PST 2001 version (by McKinsey)

Beyond the free Mckinsey PST practice test linked above, MyConsultingCoach offers fully comprehensive PST packages to take your PST prep to the next level. Of course, you might pass the PST on your own. However, as we have noted, the average candidate only has a 33% chance of passing.

For those using an MCC package, though, that PST pass rate jumps right up to 85%. Given that you must pass the PST to get an interview and be considered for a job, this is a potentially enormous driver of whether you will work for McKinsey or not - that is the overall offer rate.

Whilst this is a premium service and won't ever be for everyone, if you really have a consulting mindset, then you can appreciate that - given the substantively increased likelihood of entry into McKinsey - the investment is more than worth it when balanced even just against the additional pay earned in year one versus a second tier consultancy. This is before we even consider the differences across your whole career and the prestige difference for your resume even if you move into other industries later.

We also stand by our service to the point that, if you don't pass your PST, we will give you half of your money back!

So, what are you waiting for? Start your prep today and take a step closer to that your dream job with McKinsey!

Following our advice and making use of MyConsultingCoach resources will give you your best chance of success in the PST . Assuming you pass your PST, then, you will have to prep for your interview . As you probably know already, interviews at McKinsey and consultancy firms in general are not like a "normal" interview. The most notable difference is that you will have to solve a case study . This is a business problem which simulates the kind of project a real life consultant would called in to deal with.

As well as a case study, each interview will also have a McKInsey PEI or " fit " component , where your interviewer tests your motivation to succeed as a consultant and establishes whether your character is a good fit for the company. This is closer to the format of more familiar interviews. However, many candidates are ruled out based on their performance in this section, as they either don't prepare for it at all, or treat it too much like a "normal" interview. The demands even in the fit section of a consulting interview are significantly more rigorous than for interviews elsewhere.

In practice, one of the main differences in interviews in consulting and on other industries is the amount of preparation that is required . If you thought McKinsey PST prep was demanding, that was unfortunately just the tip of the iceberg. The stiff competition for McKinsey and other consulting jobs means firms can demand a degree specific preparation from candidates which is not really equalled elsewhere.

This might all sound daunting (frankly, if it doesn't, it should...). Don't worry though - MyConsultingCoach has you covered! This website is packed with articles which will give you solid overview of all the various topics you will need to understand (you can start with our articles on the case and fit interview and work your way out from there) as well as guidance on how to approach your prep in general.

For a more in-depth experience, we have also developed MCC Academy - a fully comprehensive case interview course . MCC Academy teaches the same consulting skillset as you will need for the PST, but in much more depth and applied to the business of cracking case studies. Other case systems simply teach a few formulaic "frameworks", with methods to approach a few common question types. However, this risks leaving you high and dry when the interviewer (as they likely will) gives you a questions that differs from the kinds you have learnt. By focussing on fundamental skills and teaching you to tackle cases in the same way a working consultant would, MyConsultingCoach equips you to cope with whatever your interviewer throws at you . Beyond this, the Academy also includes a set of lessons on how to perform in the fit component of your interview.

If you are serious about consulting in general, it makes sense to start MCC Academy alongside your PST prep , as the shared skillset makes for significant synergy generally and you will be able to use the Academy lessons to brush up your skills for the PST in particular. You will also then have plenty of time for case interview prep and not have to pack it all in after the PST.

Good luck with your prep!

A level of preparation you won't find anywhere else

Reason #1: beat the time pressure.

We developed techniques for each of the six question types in the McKinsey PST that will help you save time and boost your score. From practice, practice, practice to smart practice.

Reason #2: Focus your efforts

Our Performance Radar helps you pinpoint the question types where you need more preparation , enabling you to tailor your training and track your progress. No more random practice.

Reason #3: stretch your potential

Our tests were developed by a team of ex-McKinsey consultants and are constantly reviewed to provide you with the most comprehensive toolkit to succeed. Unlike many resources on the internet , our tests are realistic in their format (26-questions long, like the real PST) and challenging in their content .

We developed a sample, 10-questions free test. We suggest you print out the test and do it on paper to replicate the real test environment

“ The Performance Radar changed the way I prepared for the McKinsey Problem Solving Test: I moved from a random 360-degrees practice to a structured preparation focused on the areas where I was weakest. And those same areas quickly became the ones where I was getting the highest scores. ”

Our pst preparation programmes

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Single pst #3, frequently asked questions.

When you do not have much time left we suggest you to:

• Understand how the test is structured : many people fail the PST simply because they don't know it well. You can find all the details about the PST on our PST Guide. You may want to double check the total time, since most offices will give you 60 minutes but some others 70.
• Develop a solid answering technique : It is essential for you to acquire an answering technique allowing you to make the best use of the very limited time in the test. Our video and the PST Guide will help you a great deal.
• Practice smart : We advise you to try the official tests on the McKinsey website ( Test A , Test B , and Test C ). If you want to boost your chances our best pick is the Test Ready Package above. You will have the chance to practice on three 26-questions full-length sample PSTs. Then, our Performance Radar will help you identify your weaknesses by translating results in your performance across the 6 PST question types. The PST Guide will teach you useful methods on how to tackle each question type and the 60 additional questions will help you master a sound technique for each of them. In other words nothing will be left off the checklist!

P.S. Do check whether the first round of interviews is immediately after the PST or on a different day. In the former case, we strongly advice you to prepare for case interviews . The Beyond Test Ready package also includes 1 hour of case interviews with our Mentors.

Passing the PST is hard mainly because of the time constraint. If you had 2 hours, you could easily score more than 90% - but you only have 1 hour. It is therefore essential for you to be able to manage time. Please use the video that's on the page.

Sure. You can ALWAYS upgrade from a smaller to a more comprehensive package.

Upgrading is easy:

• Purchase the new package
• Email us at [email protected] within 30 days – we’ll refund your original purchase within 24 hours.

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McKinsey Problem Solving Aptitude Test

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McKinsey Problem Solving Game (Imbellus): a Complete Practice Guide to Pass the Digital Assessment

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There is a lot of secrecy around the McKinsey Problem Solving Game, aka Imbellus.

This gamified assessment is used to filter out a large chunk of the many McKinsey applicants, and it’s supposedly crack-proof.

The internet is packed with blog posts, Reddit discussions, and forum threads about the McKinsey PSG, some even contradicting.

This information overload coupled with the huge importance of the test makes the whole preparation process nerve-wracking.

That’s why this practice guide strives to give you accurate and easy-to-digest information about your upcoming test.

It includes:

• A complete overview of the mini-games
• The best things to keep in mind while playing them
• The most helpful practice options available right now
• Useful tips and tactics to increase your chances of passing it

So, buckle up, and let’s get started.

Find out everything you need about the  McKinsey Problem Solving Game , aka Imbellus, and prepare using actual simulations!

What is the McKinsey Problem Solving Game (PSG)?

The McKinsey Problem Solving Game, also named McKinsey Imbellus, McKinsey Digital Assessment, and Solve, is a gamified test that replaces the previous assessment, PST, in the recruiting process. The PSG consists of two mini-games lasting for 70 minutes and evaluates candidates on five key cognitive abilities.

Only candidates who pass this stage are invited to the next hiring step, the case interviews.

What Skills Does the PSG Evaluate?

The PSG evaluates the consulting traits and qualifications of a candidate and then compares them to a real McKinsey consultant. If the applicant appears similar or better than the actual consultant, they'll pass the test.

Five main thinking skills are being assessed :

• Critical Thinking : The ability to solve problems by breaking them down into smaller parts.
• Decision-Making Process : The ability to take in large amounts of information and process it efficiently to make the best possible decision within time constraints.
• Meta Cognition : The ability to monitor your cognitive processes and improve them.
• Situational Awareness : The ability to keep track of several tasks or activities concurrently.
• Systems Thinking : The ability to identify the root causes of problems and possible solutions.

Do All Candidates Get the McKinsey Problem Solving Game?

As of 2024, almost all candidates for nearly all Mckinsey offices receive the Problem Solving Game. The PST, on the other hand, is no longer in use.

Get to Know the McKinsey PSG Format Inside Out

The Problem-Solving Game is sent to candidates once they pass the initial resume screening, making it the second hiring step.

McKinsey has created five mini-games, but you'll need to take only two of them. The most common ones are Ecosysystem Building and Redrock Study , and there are four other less common mini-games that only a fraction of the applicants receive (outlined below).

The time limit for the two common mini-games is 70 minutes , and for the others, it may range between 60 to 80 minutes. Each game will also have a tutorial, which is untimed.

Now, let's dive into each of the mini-games so you'll know what to expect on the test.

• Ecosystem Building

The first mini-game you'll need to pass is Ecosystem Building. In this game, you'll be randomly placed in either a mountain ridge or a coral reef scenario.

Your main objective in this mini-game is to build a sustainable ecosystem using exactly eight species from a collection of 39 species.

To achieve this goal successfully, you must strictly follow these guidelines:

• Terrain specs : The chosen location in the ecosystem must provide suitable living conditions for all eight species.
• Calories balance : Each species must be fed with enough calories from food to sustain itself.
• Food chain continuity : Each species must not be eaten into extinction by its predators.

The gaming platform provides specific information to help you meet these guidelines (some are seen in the game's "guidebook"):

Terrain Specs

Each location in the ecosystem has seven to eight terrain specs. You can choose a location using a pinpoint.

Of these seven or eight specs, only four can be displayed at any given time, using a checklist table in the upper-right corner of the screen:

Now, here's what's crucial about these living conditions:

Each species has specific terrain specs that have to be met. If they aren't met, the species won't survive, and you won't achieve the game's main objective.

Luckily, the species' living conditions usually come in ranges, allowing you to be more flexible with the species you choose for your ecosystem.

Additionally, each species has only two to four terrain specs , when Depth/Elevation and Temperature appear for all species:

Knowing that you only need to look at specific terrain specs on the checklist table helps eliminate species or locations that are not suitable for creating a sustainable ecosystem.

Food Chain Continuity

The 39 species are divided into producers and consumers.

Producers are plants and fungi (in the Mountain scenario) and corals and seaweeds (in the Coral Reef scenario). They don't have any calorie needs, so their "calories needed" spec is always zero.

Consumers are animals that eat either plants, other animals, or both. Some consumers are at the top of the food chain and therefore not eaten by any other species.

While creating the food chain, it's important to ensure that no species is eaten to extinction. This can be monitored using the " calorie needed " and the " calorie provided " specs that each species has (shown below).

Calories Balance

Each species has a calorie needed and a calorie provided, as you can see below:

A species lives if its "calories needed" are less than the sum of the calories provided by other species it eats (other consumers or providers).

Furthermore, the species' "calories provided" must be higher than the sum of the calories needed by other species that eat it.

The Main Challenges of the Ecosystem Building Mini-Game

Ecosystem creation is first of all a decision-making game.

You get all the information you need to deliver correct decisions so there's no uncertainty or inaccurate details.

The problem is that you have a vast amount of information to absorb, calculate, analyze, and prioritize . This includes the specs of 39 species, the terrain specs of each location, and eating rules.

Some of the information is irrelevant and is there to distract you or tempt you to make assumptions . In this mini-game, you must not make any assumptions and you don't need to have any environmental, ecological, or zoological knowledge.

So, your ability to make quick and accurate calculations and ignore irrelevant data will have a great impact on your performance.

The preparation course we recommend on this page includes a replica of McKinsey's Ecosystem Building game. It enables you to practice using a like-for-like game experience and learn about every single rule, move, and item in detail. Plus, you’ll master calculation methods and other tactics to ensure the food chain survives in your chosen location.

Redrock Study

The second mini-game you'll most likely encounter is Redrock Study. 

In the game's storyline, your task is to analyze the species inhabiting an island, which includes wolves and elks. The objective of your analysis is to formulate predictions and conduct various calculations , specifically focusing on percentages, by examining data on the evolution of the animal population.

The game has 4 sections:

• Investigation   You will be presented with a written text that includes tables and graphs. Your task is to sort information and gather valuable data for the following test sections.
• Analysis   You will be presented with 3 or 4 math problems ; each is separated into two parts. You will be given a calculator and a Research Journal to gather information relevant to the questions.
• Report You will be presented with two types of questions - 
• 5 written questions regarding your findings in the analysis section
• 1 visual question in which you will need to choose a graph and use it to show what you found in the analysis.
•  Cases You will be presented with 6 to 10 questions that are unrelated to the analysis you did so far. 

You will have 35 minutes to complete all four sections , with a short, non-timed break before each one. 

Alternative Mini-Games

As of 2024, the Ecosystem Building game is constant, but the second mini-game may vary in rare cases. This means that there's a slight chance you won't get the Plant Defense mini-game, but rather one of the three we show below.

Disaster Management

In the Disaster Management game, you have to identify what type of natural disaster has happened to an animal population in an ecosystem.

Then, based on the data and information given, you need to choose a different location that will ensure the survival of the ecosystem.

The Disaster Management mini-game has only one objective - the sustainability of the ecosystem, similar to the Ecosystem Building mini-game.

Disease Management

In the Disease Management mini-game, you have to identify patterns of a disease within an ecosystem and predict who will be infected next. You can then use the information given about each species to help you solve the problem.

Migration Management

Migration Management is a turn-based puzzle game. The candidate must direct the migration of 50 animals while helping them arrive at their destination with minimal casualties and with a pre-determined amount of resources.

• Plant Defense

Plant Defense is a turn-based mini-game (similar to popular Tower Defense games). Your main objective is to defend a native plant that's located at the center of a 10x10, 10x14, or 12x12 grid from invader species, using defensive resources for as many turns as possible .

This mini-game consists of three maps, and each map is divided into two - the planning phase and the fast-forward phase. McKinsey recommends allocating 12 minutes per map, which makes it 36 minutes in total.

The 36-minute time limit is not fixed though, as it depends on how long it took you to finish the first mini-game, Ecosystem Building.

Many candidates mention that the Plant Defense game is more challenging than the Ecosystem creation. So, keep that in mind while taking the first one and plan your time wisely .

Now, let's take a closer look at the different elements and resources of this mini-game:

Your base is the native plant that you have to defend from invaders at all costs. Once an invader reaches the base, you lose the game.

Note that eventually, everyone loses, and you can't hold your base forever. But the more turns you manage to survive, the better .

There are two types of invaders in the game - Groundhog and Fox. Their movements on the map are the same, and the only difference between them is the terrain type that holds them back (more on terrains below).

Once an invader appears on your map, it will choose the shortest path to reach your base plant. This path will be shown as a yellow arrow .

There are three types of terrains in the game:

• Forest : Slows down the Groundhog for one turn
• Rocky : Slows down the Fox for one turn
• Cliff : Blocks both the Fox and the Groundhog from passing this square

Each terrain holds one grid on the map, and you cannot place terrain on a grid that already has another terrain or a defender on it (more on defenders below).

As opposed to terrains, defenders don't just slow down or block an invader, they eliminate it for good.

There are several defenders you can use in the game: Bobcat, Falcon, Wolf, Python, and Coyote.

Note that you won't see all of the defenders at once.

Each defender has two important specs you must take into account:

Range : Each defender can cover a pre-determined number of grids on the map. For example, a Python can cover only one grid, while a Falcon can cover as many as 13 grids.

Damage : Each defender can cause specific forms of damage to an invader's population. When an invader attacks, you'll be able to see its population number and the damage that your defender can cause him. A Wolf, for example, has a damaging impact of 60, while a Falcon has only 20.

The Main Challenges of the Plant Defense Mini-Game

In this mini-game, you have to make decisions based on limited information and face unexpected events (like new invaders from any direction). Also, you must achieve two simultaneous objectives - survive each of the turns separately and for as long as possible.

This is the complete opposite of the Ecosystem Building game, in which you have all the data in front of you, and you have just one objective.

Two things that can help you overcome these challenges are (1) preparing for the unexpected events that will happen during the game and (2) planning low-risk solutions based on your resources (terrains and defenders).

The prep course that we recommend on this page has the closest simulation possible to the actual Plant Defense game. It has the same gameplay, invaders, and resources, and it's based on the same algorithm that appears in the McKinsey Problem Solving Game. This will enable you to learn the most effective tactics to ensure your base plant survives as many turns as possible.

How to Beat the McKinsey Problem Solving Game?

The proven way to beat the McKinsey PSG is by properly preparing beforehand.

There's no way around it. That’s because the mini-games include an immense amount of information, rules, and patterns you must master . And they require you to use tactics and strategies that are not obvious and take time to plan and execute.

All of that is under great time pressure and the high stakes of possibly failing it and losing an opportunity to work at McKinsey.

Now, there are a few practice options you can use to get a better understanding of the PSG and improve your chances of passing it, with the PSG Interactive Simulation being the most accurate one.

McKinsey Problem Solving Game Practice Options

Psg interactive simulation.

The  PSG Secrets simulation is an interactive platform that includes accurate practice for every part of McKinsey’s PSG. It mirrors what the actual game scenarios look like, what each button does, how the logic of the games works, how it generates the data, and more.

It has a full simulation option (two mini-games, 70 minutes), which includes:

• A full video course in 24 videos and 2h30m of content on Ecosystem, Redrock, and Plant Defense
• 2 excel solvers for the Ecosystem Game
• 10 Redrock test drills specifically for the case section
• 152 page-pdf guide 
• 60-day money-back guarantee.

Tips to Improve Your Performance on the McKinsey Problem Solving Game

Here are several specific tips to help improve your overall performance on the test as well as tips to avoid any disturbances that could hurt your score:

#1 Sharpen Your Mental Math Abilities

The ability to make fast and accurate calculations can help a lot in this Problem-Solving Game. That’s because one wrong calculation might ruin your carefully built Ecosystem or cause an invader to reach your Native Plant.

There are several free apps and sites, like the renowned Khan Academy , that can help you improve your math skills quickly.

#2 Learn Fast Reading Skills

Mckinsey’s PSG requires you to absorb and analyze a tremendous amount of information under strict time constraints.

Fast reading skills come in handy in this test and can help reduce the amount of time needed to understand the numerous guidelines of the mini-games.

There are certain apps and browser extensions that allow you to practice this important skill , even on the go.

#3 Focus Only on What Matters

Don't get nervous when you first see the immense amount of data on the mini-games. That’s because a lot of the data is irrelevant, and you’ll be only using some particular parameters .

For example, in the Ecosystem game, you’ll only have to use specific species and terrain specs for your calculations, while ignoring others that are there only for distraction.

In the complete   PSG Simulation Practice , you’ll see how to remove as much as 70% of the irrelevant data and remain just with the information that matters.

#4 Ignore Outside Information

While taking the assessment, especially the Ecosystem game, try to ignore any outside knowledge and information.

For example, if you’ve learned biology or zoology and you see that your food-eating rules don’t seem logical but the numbers are correct, always go with the numbers .

If you start to rely on previous knowledge, you might get confused and mess up your progress in the game.

#5 Learn to Solve Problems Like a Consultant

The PSG measures your consulting traits and compares them to a model McKinsey consultant.

That’s why learning to think and solve problems like a real consultant can help you pass this assessment.

Two main problem-solving skills you should practice are decision-making in fully controlled situations and with limited information.

Both of these skills can be trained using complex strategy games (examples are mentioned above) as well as  practicing with the   full PSG interactive simulation .

#6 Cut Down on Calculation Time Using Microsoft Excel

Mental math is an effective way to make calculations in the mini-games.

But as you’re only human, it’s not error-free. That’s why using a calculation tool, such as Excel formulas, can be a great way to make super fast and accurate calculations.

You can use it to gather all the relevant data, arrange it with columns and formulas (even in advance!), and turn the whole process into a no-brainer.

That said, you’ll need to use another monitor (preferably with a different browser) or another laptop since the assessment’s platform will take over your entire screen.

#7 Prep Your Hardware and Internet Connection

The last thing you want during the assessment is a “blue screen of death.”

It may happen if your hardware is not strong enough, since the McKinsey PSG is pretty demanding in its system requirements.

Any computer that is more than five years old or without an HD screen will likely encounter lags and performance drops.

Also, you must have a fast and stable internet connection. If you get disconnected in the middle of the test, you might need to start all over again or even reschedule for another testing date.

The PSG scores are divided into two types -

• Product score - the final outcome of your performance
• Process score - the efficiency (time and number of clicks) of your performance 

If you get the   PSG Practice Simulation , you’ll have a mock grading system that monitors your results and behavioral patterns.

This will allow you to track your progress while you practice for the test and see which areas demand improvement.

Why Did McKinsey Develop the Problem-Solving Game?

McKinsey created the Problem-Solving Game as an unbiased way to identify candidates from around the globe with strong cognitive abilities. The former assessment, Problem Solving Test (PST), was less challenging for candidates who were familiar with standardized tests, such as SAT and GMAT, or used the numerous mock tests found online.

The PSG, on the other hand, is supposedly crack-proof. That's because it takes into account the approach you use to solve the problems and not just the final solution. This seemingly removes any lucky guessing and shortcut techniques that were common on the McKinsey PST.

While on the PST you had just your final score, on the PSG your score is comprised of dozens of scoring criteria apart from your final result , including mouse movement, keystrokes, and clicks.

McKinsey can analyze these factors for every recorded candidate, which allows them to compare candidates more fairly.

What Does Imbellus Mean?

Imbellus is a company that creates immersive simulation-based assessments to assess cognitive processes. To develop a new testing format for the McKinsey recruitment process, they've teamed up with McKinsey consultants and UCLA Cresst psychologists.

In 2020,  Imbellus was purchased by Roblox , an online gaming platform, to help sharpen its recruitment practices.

This was an in-depth prep guide for the McKinsey Problem Solving Game. It gave you an overview of the different mini-games, explained their main challenges, and offered some useful solving tips.

Additionally, you saw the best ways to prepare for the assessment, when the PSG Practice Simulation being the most realistic and accurate one.

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McKinsey Problem Solving Test Practice Test C

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How To Prepare For The McKinsey Problem Solving Assessment? – Practice Questions & Preparation Tips

The idea of completing the McKinsey Problem Solving Test (McKinsey PST) can be overwhelming, especially when you don’t know what to expect from this test. The PST test was created by some of the most intelligent people from one of the most competitive consulting firms.

But if you learn more about this test and practice beforehand, you will have a better chance of making it through the PST test. Passing the PST is essential because it will be the only obstacle left before getting to the McKinsey job interview.

Table of Contents

About the McKinsey PST Test

McKinsey & Company use the McKinsey PST test to choose candidates before the interview process begins. This test is typically handed out after the company has screened your resume.

There are six types of questions in the PST test that will assess a candidate on three different essential problem-solving skills in the PST test. The PST test is a multiple-choice test. These problem-solving skills will include logical reasoning, interpreting data and mental calculations.

Officially, McKinsey & Company has never mentioned a passing score or an acceptance rate for the PST test. But there is a rough estimate of 30 to 35% for an acceptance rate, and the pass mark of being approximately 70%. This percentage means that one in three candidates will pass the McKinsey PST test.

Now, the McKinsey PST is in the process of being replaced by a new Problem-Solving Game. But this process hasn’t been completed internationally. This new Problem-Solving Game still uses some of the fundamental principles from the old PST test.

Take McKinsey Problem Solving Assessment Practice Test Now

What Skills Are Assessed in the PST Test

The different types of questions in the PST test aim to assess a subset of skills that are handy in consulting. You should keep in mind that PST example questions and practice tests will only get you so far without developing the skills needed.

For example, if you’re trying to learn math, the sums won’t make any sense if you don’t know how to add them together.

But what are the skills that are going to be assessed in the test?

Identifying Root Causes

Consults need to be able to find the real cause of a problem. It won’t be good enough only to fix the problem at a superficial level. You will need to keep digging until you find the real cause of the problem you’re dealing with.

Like a doctor treating a patient who complains of a chronic headache, you will need to look for the real cause of the problem. A good doctor will want to treat the sickness, not just the symptoms.

The doctor will work and find the real cause might be stress or bad eyesight. In this case, the doctor might recommend a few ways to create a more relaxed lifestyle or visit an optician to improve their patient’s eyesight.

Draw Fact-Based Conclusions

Consultants will need to know how to interpret data and the information that’s presented to them. Their interpretation will be the basis of their recommendations and diagnoses.

These recommendations mustn’t be based on your opinions or your gut instincts. Remember, it’s just the facts, man to draw a valid conclusion.

Prioritisation

The PST test will also assess your ability to prioritise essential information and calculations. Being able to prioritise information will help you answer all the questions in the PST test. Being able to deal with uncertainty will help you find a good compromise between speed and accuracy.

You will also need to know how to choose vital pieces of information from large bodies of text. You will also need to deal with any vague pieces of text. Once you’ve established the facts of what’s happening in the text, consultants will be able to find the “so-what” factor of the information.

Numerical Agility

There will be questions in the McKinsey PST test where you will be expected to make some calculations. In the test, you won’t be allowed to use a calculator. So you will need to be able to do math calculations in your head, especially making quick estimates.

Reading Charts

In the McKinsey PST test, you will need to go through your case interview thoroughly. You will need to be able to do this quickly and accurately to find the information you need from the graphs and tables.

The information from these graphics will help you find the root causes of problems, find fact-based solutions or the mental calculations you’ll need to complete.

Deal With Formulae

In the McKinsey PST test, you won’t be expected complete complex math equations. At most, the math in the PST test will be at the high school level. The formulae are typically simple, and you won’t have to wrestle with any complicated algebra.

However, it won’t be clear how you should handle these problems. In most cases, you will need to create equations by focusing on one or two primary relationships. The PST test will often disguise this information in large amounts of typically useless pieces of information.

The biggest challenge will be figuring out what is the relevant information. Once you’ve figured this out, working with formulae should be relatively simple. But the limited time and not being allowed to use a calculator might present an extra challenge to candidates.

Different Types of Questions in the PST Test

In the paper-based PST test, candidates will have one hour to answer 26 questions without a calculator. The questions are all multiple choice based on three different business cases. Recruiters will provide candidates with a few pencils, a watch, and scratch paper.

Because the business world is changing, the recruitment process for candidates has become even more complicated. This change means that there needs to be another way to information in the McKinsey PST test.

Reading Facts

In the McKinsey OST test, the questions in the reading facts section will assess your ability to extract and expand on information presented in tables and graphs. The reading facts questions are the most common types of questions in the PST test and can make up approximately 35% of your test.

The usual format of these questions will include the following: 

• What is the current ranking of options one to five?
• Which of the following values is the best estimate of…?
• Based on the data, which one of the following statements is valid?

Root-Cause Reasons

These questions in the McKinsey PST test will assess your ability to find the cause of an underlying business problem. These questions can range from asking about facts on a business which need to be further explained.

In this section, the PST test will present you with a list of a few accepted explanations related to the facts about the business. But only one of these explanations is logically sound in the context of the question. You will need to find the correct answer.

The typical format for these questions could include the following:

• Which one of the following explanations does NOT help with explaining why…?
• If this explanation is true, which of the following statements explains why the CEO wants to go ahead to…?

Fact-Based Conclusions

In this section, the McKinsey PST will test your ability to find logical conclusions from a collection of information and facts in this section. These questions can vary greatly in this test. They can range from being similar to the reading facts questions to you needing to make some complex inferences from a vague text.

These tests will typically be formatted like the following: 

• Based on the information in the table… Which of the following statements is valid?
• Which of the following statement can you use to draw a conclusion?

Word Problems

In this section of the PST, you will be expected to find solutions for business problems from the information you find from different sources. The biggest challenge for this section is that the information you need will spread across exhibits and different texts.

The word problems found in the GMAT will be closest to the word problems found in the PST test. The typical format of these questions will be the following:

• If the employees’ salaries are increased by 25%, how much will productivity need to increase for the business to break even?
• Suppose the economy keeps growing by 4% each year for the next decade; which of the following equations best approximates the decrease in the debt/GDP ratio?

Some examples of these questions might include: 

• Suppose a machine will cost $3m. How many years will it take for the company to break even from its investment?
• If a worker is paid ten hours per month, which one of the following formulae accurately calculates the average number of utensils handled per worker per month?

Client Interpretation

In this section of the PST test, the questions will evaluate your ability to understand the project requirements and the analyses needed to address any concerns from the clients.

When consulting on a project, you will need to communicate on a daily basis with the stakeholders from the client company. Essentially, the client’s interpretation section of the PST test is about understanding the following:

• Which analysis decisions will be the best to take to meet the client’s needs?
• What has the client implied about the given strategy?
• What does the client say, and how will it impact the scope of the project?

The typical format for these questions will be the following:

• Which one of the following statements best describes the thoughts of the CEO regarding the project?
• Which one of the following statements best summarises the concerns of the CEO?
• Which one of the following statements best describes the CEO’s goals for the McKinsey study?
• With the goals of the CEO in mind, which would least useful question for your team to answer?
• Which one of the following analyses would be the least useful when addressing the CEO’s concerns?
• Keeping the opinion of the Department Head in mind, which of the following statements is most valid?

The formulae questions for the McKinsey PST test will show a quantitative word problem as a formula . This section will assess your understanding of abstraction and test your skills in extracting information and breaking down problems.

Preparation Tips

To prepare for the McKinsey PST test, you can do a few things before and even during the test.

Manage Your Time

The McKinsey PST test is time-limited, and you will only have an hour to complete the test. An hour can be a lot quicker than you think, so you will need to find a good way to manage your time during the test.

A good way to manage your time during the test will be to set a limited amount of time you’re going to spend on each test and stick to it. You will need to practice ensuring that you don’t go over the amount of time you’ve set for yourself.

First, Quickly Read Through the Answers

The McKinsey PST will provide complicated graphs and charts that could easily take the whole hour to understand. To ensure that you get an idea about the important information that you will need, you should first skim the answers provided and then check graphs and charts.

You Should Take Questions Literally

It’s important to remember that the questions in the McKinsey PST test aren’t trying to use vaguely worded phrases to trick you with hidden meanings. You will need some critical reasoning skills to answer these questions correctly. However, you should take these questions literally.

Practice Your Math Skills

Even though Math might not be your forte, the good news is that you won’t be expected complete complicated equations. The other bit of good news is that you can always practice to improve your mental math skills and get ready for the McKinsey PST.

In the real test, you will be tested on division, multiplication, subtraction, and addition. But the biggest challenge will be solving these equations both quickly and accurately.

Estimate Your Answers

When you’re busy working through the math questions in the real test, you need to take a look at the answer choices you’ve been given and use estimations that will lead to the correct answer.

Correctly Answer the Questions in All Scenarios

When you’re busy with the data interpretation questions, you will need to select an answer that is completely supported by the information provided. In some situations, the multiple-choice answers might seem in line with the information provided but not completely. If you come across this answer, it’s recommended that you don’t use this answer.

Only Focus On Relevant Information

Because you will only have an hour to complete the test, you shouldn’t thoroughly read each word in the test. Certain parts of the McKinsey PST test, such as some graphs and parts of the text, won’t be useful for answering your questions.

When you’re skimming the information, you should make notes about, circle and underline the parts that you will need to answer the questions. You should read each line quickly to see where you need to focus your attention.

Analyse Data Systematically

Some candidates have that the most challenging part of the McKinsey PST will be analysing the charts and graphs presented and data interpretation. We suggest that you use a process that works for you to analyse the data.

You can start by figuring out what the table or graph represents by reading the titles and labels. Then you can understand the data in the areas that seem to differentiate or might seem important.

Be Sure to Answer Every Question

In the McKinsey PST test, there are either correct answers or incorrect. There are also no penalties for giving the wrong answers on the test.

We recommend that you rule out the incorrect answers and estimate your answers if you’re not completely sure about the answer to a question. If you’re running low on time, you should randomly choose answers instead of leaving the answers blank.

Stay Calm and Breathe

When you’re taking the test, you should control your breathing and stay calm. You’ve already spent down everything you can before the test by practising mental your math skills and data interpretation skills. During the test, you need to just focus on doing your best.

Final Thoughts

Hopefully, after reading this article, you should be more prepared for taking the McKinsey PST test. By completing the PST test, whether you pass or fail, you will learn a lot from the process, and you should be proud to complete the test. Besides, not many candidates will make it to this stage in the selection process.

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Sarah is an accomplished educator, researcher and author in the field of testing and assessment. She has worked with various educational institutions and organisations to develop innovative evaluation methods and enhance student learning. Sarah has published numerous articles and books on assessment and learning. Her passion for promoting equity and fairness in the education system fuels her commitment to sharing insights and best practices with educators and policymakers around the world.

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McKinsey Aptitude Test Questions

In our McKinsey case study, JobTestPrep has compiled a list of examinations that we have determined will be present during your McKinsey assessment test.

• McKinsey Numerical Test - In CEB’s SHL  numerical exam , you will be measured by how you evaluate and calculate. The test is not difficult to answer, rather the purpose is to overload you with questions and see how you react to an impossible timed clock. Thus, it’s best to remember that it isn’t about how many questions you answer, rather how successful you are at responding. Thus, the best thing you can do is to begin to self-practise and become familiar with the questions, all possible with our help.
• McKinsey Verbal Reasoning Test - The purpose of the  verbal reasoning exam  is to determine your comprehension level. Furthermore, it will assess how you process written information. You will find formats such as true, false and cannot say. Typically, McKinsey uses CEB’s SHL which you can begin to practice here through JobTestPrep.
• McKinsey Excel Test - Another test that is focused on during the examination stage of your interview process is  Microsoft Excel . No matter where you may be in the company it’s likely you will work with Excel. This is why so many companies permit an exam to appear during the assessment. In our version of the exam, you will see graphs and tables to display various spreadsheets and answer in multiple choice format.
• McKinsey Problem Solving Test (PST) - In this section of the exam is much like  SJT  (situation judgement test). You will encounter previously dealt with McKinsey client situations. It will be your job to answer truthfully as this could be your future. This is also a great time to assess if you think you will enjoy working in such situations. The questions are frequently formatted with tables and charts allowing you to implement your logical thinking. You will also be required to use verbal reasoning after reading a text explaining the scenario.

McKinsey Selection Process

The McKinsey interview process can become daunting with its intense application process, however, with the proper McKinsey preparation, it is possible to conquer and win over the McKinsey upper-management. Below is a thorough breakdown of what to expect during your journey to a McKinsey career:

• McKinsey CV Submission: Most past McKinsey job applicants have applied on McKinsey’s main website. There you can find a concise list of currently vacant positions along with the locations.
• McKinsey Online Assessment Tests: Upon completing your McKinsey online application, you will be invited to take a few McKinsey aptitude tests. These can include, numerical, verbal, SHL, PST (problem-solving tests) & more.
• Pre-Employment Telephone Screening: For the telephone conversation, you can expect McKinsey behavioural interview questions. These questions are similar to SJT (situational judgement test questions) where you will be placed in a situation and will have to imagine what you will do in a particular McKinsey job situation.
• McKinsey Job Interview: The last stage is having the in-person  interview . It is important to know a little bit about the company to show your interest level. The interview questions at Mckinsey are thought-provoking, it’s best to respond using the  STAR method , as this is a concise way of responding to allow you to be set apart from the overall competition.
• McKinsey Assessment Centre: In the McKinsey  assessment centre event, you can expect to attend presentations to learn core values of the company, you will play job simulation games such as role-playing and team building exercises to further team-buildingpersonal skills. It is also possible to take additional assessment tests, become involved in group interviews as well as personal one-on-one.

McKinsey Advanced Professional Degree (APD) Interviews

The McKinsey Advanced Professional Degree (APD) Interview process is composed out of three interviews. The two first interviews are 45- minutes one-on-one interviews. Each of the two first interviews will include a personal experience interview (EPI) and the Mckinsey case interview to test your problem-solving skills. In the Mckinsey case interview you will be required to answer questions involving a business case study, while the personal experience interview questions at Mckinsey will focus on the specific role you are experienced at, and the actions you took as a part of it that were crucial for success.

The third and final Interview will take place in the office you applied to. The format of the final interview is slightly different for each office, therefore you will be receiving a detailed description prior to your assessment day.

The interview process at Mckinsey is highly competitive and challenging, get your Mckinsey interview preparation here at JobTestPrep to ensure your confidence and success in the interview process. 

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McKinsey Problem Solving Test Practice Test C

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The Mckinsey & Company Problem Solving Game

The Mckinsey Problem Solving Game (PSG) is a simulation-based assessment tool designed to test a candidate’s ability to think critically and approach complex business problems. The game is used by Mckinsey & Company during their recruitment process to identify candidates who possess the necessary analytical and problem-solving skills to succeed in the industry.

HOW DOES THE PROBLEM SOLVING GAME WORK?

Since February 2023 the PSG Scenarios have been reduced down to the Ecosystem Scenario and the Redrock Study Task . This means you are guaranteed to be asked to create a sustainable ecosystem. You will have 35 minutes to solve each scenario.

Pre-February 2023, the PSG had 5 scenario games that candidates have reported as part of the PSG. Each candidate is given 2 out of 4 games to solve in a 70-minute time slot. The vast majority of candidates are given the Ecosystem Builder and then the Plant Defense scenarios to solve. There have been a small number of cases with candidates being given the Disease Diagnosis or Disaster Identification instead of the Plant Defense scenario.

1. Ecosystem Builder:

The objective of the Ecosystem Builder game is to simulate the process of building and maintaining a sustainable ecosystem. The candidate must balance various factors, such as environmental conditions and predator-prey relationships, to ensure the long-term viability of the ecosystem. The game tests a candidate’s ability to process large volumes of data, think systemically, and make informed decisions based on incomplete or ambiguous information.

2. Plant Defense:

The objective of the Plant Defense game is to simulate the process of defending a plant from pests and diseases. The candidate must identify the appropriate treatments and implement a strategy to protect the plant while minimizing the impact on the surrounding ecosystem. The game tests a candidate’s ability to think critically, analyze complex information, and make informed decisions under pressure.

3. Disease Diagnosis:

You are tasked with identifying and diagnosing an unknown disease that is affecting members of an animal population. Using a vast amount of data, you must determine the root cause of the issue and propose a treatment plan. Your diagnosis and treatment plan should be based on a comprehensive analysis of the available information.

4. Disaster Identification:

Your task is to identify the type of natural disaster that is causing the death of members of an animal population. Like the disease diagnosis scenario, you need to determine the specific nature of the disaster based on available information. Once you have diagnosed the problem, you must select a suitable relocation site where the animals can thrive. This decision must be based on a comprehensive analysis of a significant amount of data, much like in the initial stages of the Ecosystem Building scenario.

5.Redrock Study:

Redrock Study Task, often referred to as Redrock, has assumed the role of the second scenario within the McKinsey PSG, replacing Plant Defense. Although the precise scoring mechanism for the game is not explicitly detailed, we can infer, given its math-like format akin to the former McKinsey PST, that the final score is computed based on the number of correct answers. The Redrock study task involves comprehending a written report and solving mathematical problems using the information embedded in the report. It’s essential to acknowledge that due to Redrock’s similarity to the previous PST, there exists the potential for candidates to incur deductions for incorrect responses. Therefore, it’s imperative to ensure that every response you provide carries significance, as it might affect your score.