McKinsey Interview - Common Case Types

Question

Hi,

I have my upcoming interview with McKinsey and I only have 3 weeks left to prepare. I started today with understanding the frameworks and I try to become really familiar with profitability + market entry frameworks and I am wondering, which type of Cases should I also focus on additionally? And which frameworks are the best to memorize? When it comes to profitability cases for example, is it enough to structure the framework around revenue + costs or should you add another bucket like market? That is difficult to know, since different sources state different frameworks.

Additionally, I have some other questions:

How to write down the information from the case as efficiently as possible since they are reading quite fast and you are not able to write everything down in that pace
How many cases should I practice? I don't have a partner and would practice by myself and with AI
Should you always ask clarifying questions?
Where to find the best cases specifically for McKinsey to practice? (I already have done the cases from the website)

Thank you very much in advance!

Answer 1

Hi,

First of all, with three weeks only I would be very deliberate about how you spend the time. McKinsey cases are interviewer-led and specifically test whether you can build a structure tailored to the exact problem, so a memorised "standard" framework is likely to hurt you. On your questions specifically:

On case types, I'd recommend you get familiar with profitability, market sizing and market entry, growth/revenue, M&A/investment, pricing and operations.
On profitability structure, I would almost always add a market/external view alongside revenue and cost, since looking at competitors and market context in parallel usually gets you to the real driver faster.
On note-taking, set up your page before they finish talking (objective at the top, room for your structure, a column for numbers) and capture only keywords and figures.
On volume, there is no magic number, but the most important thing is to train with experienced peers and/or a coach (given your tight timeline, I'd strongly recommend you to invest on a coach).
On clarifying questions, better to always ask them and take advantage of the opportunity, but make sure they are relevant to the case and sharp (2-4 is a good proxy).
On where to practise, beyond the McKinsey site and PrepLounge case library, look for interviewer-led cases, and, as said, leave solo and switch to peers/coaches as soon as you can.

Hope it helps, and feel free to DM me if you want to discuss how to best prep for your upcoming interview.

Best,

Federico

Answer 2

Hi,

Start with the most important thing: memorising frameworks is the wrong approach. They don't ask for a framework, they ask what factors you'd consider, and canned structures are visible immediately. Learn the underlying logic instead, then build to the specific objective every time.

On your questions:

Which case types. Beyond profitability and market entry, cover growth strategy, pricing, cost reduction, M&A and operations. But the bigger point is that McKinsey cases are often non-standard, so the return on a fifth framework is much lower than the return on being able to build one from scratch.
Profitability structure. Revenue and cost is the right spine, and everything else hangs under it. Adding a "market" bucket alongside them isn't wrong, but only if the case actually calls for it, for instance when the decline could be industry-wide. Different sources give different frameworks because there isn't one correct answer; there's only what fits the objective.
Note-taking. Don't transcribe. Write only the objective, the numbers, and the constraints. Set up your page before the case starts, and ask them to repeat a figure if you need it.
How many cases. Aim for 25 to 30, and you need a human partner for at least half of them. Solo and AI practice is fine for structuring drills, but it won't fix pacing, pushback or presence. Find partners (or a good coach) here on Preplounge.
Clarifying questions. Only when you genuinely need something. Two is plenty, and asking for the sake of it wastes your time.
Where to practise. Casebooks from the top MBA consulting clubs are a good source for solo prep, but here on Preplounge you'll find tons of peers and coaches you can leverage.

Best,
Franco