Interview prep · McKinsey

Practise McKinsey case interview questions.

AI-graded guesstimate practice tuned for McKinsey case interviews. Practise market sizing, structured assumption-making, and arithmetic under time pressure — exactly what McKinsey grades.

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What the McKinsey loop actually looks like.

McKinsey case interviews are interviewer-led: they drive, you respond with structure. Cases include a quantitative chunk (often a guesstimate or market-sizing question), a qualitative chunk (frameworks, drivers), and a recommendation. Ed Solving Game (PSG) replaces the first round at most offices.

PSG (Solve assessment)

Online problem-solving game. Logical reasoning under time pressure. Replaces the first behavioural-style round at most McKinsey offices.

Case interview (interviewer-led)

30-40 min. Quantitative chunk + qualitative chunk + recommendation. Estimation and arithmetic appear in nearly every case.

PEI (Personal Experience Interview)

Three dimensions: leadership, personal impact, entrepreneurial drive. STAR-format with concrete metrics.

Topics McKinsey interviewers lean on.

Market sizingProfitability frameworksTop-down vs. bottom-up estimationMental arithmeticMECE structuring

What separates offers from rejections at McKinsey.

1
Drive the structure even though the interviewer leads. Lay out your buckets MECE before doing math.
2
On the math, slow down. Read the number out loud. McKinsey grades arithmetic accuracy.
3
Sanity-check at the end. "Is this answer in the right range?" earns explicit points.
4
For PEI, prep three stories per dimension. Receipts (numbers, outcomes) win.

Train the muscle, not the answer.

Free unlimited MCQs, AI-graded guesstimate practice, and a tutor that explains anything. The same platform candidates from McKinsey use to prep.

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Sources

Round-format and topic claims are sourced from the public interview-prep press above. We refresh these as companies update their loops.