How many cases should I do before round 1?

Most successful MBB candidates do 30–60 live cases. Solo drills don't substitute for live partners.

Do I need to know all the classic frameworks?

Know 4 well, not 20 badly: profitability tree, market entry, M&A (strategic/financial/risks), and a customer/4P framing.

Is McKinsey PEI different from BCG / Bain behavioural?

Yes. PEI is highly structured around 3 dimensions (entrepreneurial drive, personal impact, leadership) and McKinsey scores it formally. BCG/Bain are more conversational.

Can AI help with case prep?

Yes for question generation, framework recall and PEI story drafting. For full-case reps you still need live partners.

Case Interview Prep Guide: MBB, Big 4 and Tech Strategy

A focused case interview prep guide — frameworks, math drills, PEI behavioural — for MBB (McKinsey, BCG, Bain), Big 4 and tech strategy roles.

Reviewed by Canadian recruitersJobeefy editorialPublished May 6, 2026Updated May 6, 202610 min read

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