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, which is exactly what McKinsey grades.
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. The Problem 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.
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.
Thousands of free MCQs, AI-graded guesstimate practice, and an AI tutor. Every practice question and its grading rubric is free to read before you start. AI grading is capped at 1 answer a day on the free plan and 30 a day on Pro.
- Hacking the Case Interview: Consulting Guesstimates 2026 ↗
- IGotAnOffer: 47 Case Interview Examples (MBB) ↗
Round-format and topic claims are sourced from the public interview-prep press above. We refresh these as companies update their loops.
McKinsey and the McKinsey logo are trademarks of their owner, used here only to describe publicly reported interview formats. Journey Uncommon is not affiliated with, endorsed by, or sponsored by McKinsey.