Prepare for the McKinsey case interview.

Most client-facing McKinsey roles involve personal-experience and problem-solving interviews. Some also include expertise interviews or technical assessments. Ask your recruiter for the details and preparation material for your position.

Put those tasks on separate lines in your preparation plan. Case practice develops your approach to a new problem. Experience preparation helps you recover the details of something you actually did. Technical preparation should follow the responsibilities of the role.

If you have been invited to Solve, use the official instructions included with your invitation for that stage. Completing a digital assessment and handling a live case are different tasks, even when both draw on analytical reasoning.

Practise a business moving beauty advisers into virtual channels. Work through implementation, customer experience, investment and evidence about AI chatbots. Notice how each question tests a different part of the same decision.

That variety is useful. Before each question, identify what you are being asked to produce. A set of ideas requires organised breadth. An investment calculation requires definitions and an equation. An exhibit requires an interpretation that changes the client’s decision.

Attempt each question before looking for an answer. Say your reasoning aloud and note where you need information. Afterwards, compare the logic: did you cover the important considerations, keep the units consistent and explain what the result means?

Memorising the published answer removes the part you need to practise. Return to the method, then test it on a different problem.

“Interviewer-led” is useful shorthand when the interviewer selects the next task. It does not mean you should wait passively or forget what the client is trying to achieve.

Here is an original practice example. A tutoring centre is considering evening classes. The director wants at least £12,000 of additional cash surplus during the next term. The interviewer asks what would determine whether the launch works.

A useful answer separates demand, teaching capacity and economics. Under demand, examine which students want evening sessions and whether they would otherwise attend existing classes. Under capacity, check tutor availability and classroom access. Under economics, compare additional fees with the costs created by the launch.

Now the interviewer asks for a calculation. Move to it. You do not need to finish discussing every branch before answering the question selected.

Suppose the centre expects 80 additional students paying £400 for the term. Materials cost £50 per student, additional tutor costs are £12,000 and launch spending is £6,000. Assume these are the only incremental cash costs.

The term’s cash surplus is:

80 × (£400 − £50) − £12,000 − £6,000 = £10,000.

The launch generates cash, but it misses the director’s £12,000 requirement. Say both. Stopping at “£10,000, so it is profitable” loses the decision criterion.

To meet the requirement, the centre needs (£12,000 + £12,000 + £6,000) ÷ £350, or about 85.7 students. At least 86 additional students are needed under the stated assumptions.

That result gives the next discussion a purpose: can the centre attract six more students without increasing the tutor cost or exceeding classroom capacity?

The interviewer now says the rooms can accommodate only 80 students. Repeating the demand recommendation would ignore the new constraint.

You could examine price, cost or another feasible timetable. At 80 students and unchanged costs, the fee required to meet the cash target is £425: £50 of materials plus £30,000 ÷ 80. That is a £25 increase from the original fee.

A sensible response is: “The current plan cannot reach the target through enrolment alone. I would test whether students will pay £425, or whether we can remove £2,000 of term costs without reducing teaching quality.”

You have updated your answer while keeping the objective intact. That is the habit to rehearse across structuring, maths and exhibits.

For the personal-experience interview, choose experiences you remember well enough to discuss in depth. Prepare two examples for each confirmed theme. Connection, Drive, Leadership and Growth are the four themes used in the Japan process checked on 17 October 2026.

For each experience, recover the difficult moment. What did another person want? What alternatives did you consider? Why did you choose your approach? What did you personally say or do? What changed afterwards?

“We aligned the stakeholders” is a conclusion. The interview becomes interesting when you explain why they disagreed, what you learned from them and how that changed your proposal.

Ask your practice partner to challenge one decision in the story. If you cannot explain it without restarting the whole narrative, work on the underlying detail. For each story, prepare the decision you made, the alternatives you rejected and the evidence of your personal contribution.

Use a fresh case with someone who can ask follow-ups and change an assumption. Include experience questions in the same session so you practise switching between personal detail and analytical work.

Review the attempt through specific moments: where did you answer a different question, leave a number unexplained or fail to update your view? Repair that moment, then try a new question. A case count alone will not tell you whether the repair holds.

Before the real interview, read the invitation’s practical instructions and McKinsey’s current rules for the session. For your next practice, use a customer-retention problem to rehearse changing tasks while keeping the commercial decision in view.