Tier 2 · Oliver Wyman
Oliver Wyman case interview prep: what they test and how to train
TL;DR
Oliver Wyman is known as the most quantitatively demanding interview outside MBB. The firm has deep financial services, risk, and actuarial roots, and the case math is often heavier than at McKinsey. If quantitative speed is your weakness, OW will expose it.
Last updated: May 16, 2026. Written by the CaseXcel team.
What the Oliver Wyman case interview tests
Oliver Wyman cases test analytical depth and quantitative speed in equal measure. Cases lean toward financial services, insurance, and risk topics. Expect denser numbers, more layered calculations, and less hand-holding than at most peer firms.
Why strong candidates still fail
- Slow or imprecise math. OW has historically rejected strong-structure candidates for weak math.
- Underprepared for financial services context. Even a basic understanding of insurance, banking, or asset management matters.
Prep tactics that move the needle
Double down on mental math
OW math is harder. Daily drills are non-negotiable.
Practice multi-step calculations
Two- or three-step math under time pressure. The numbers compound; one wrong step ruins the answer.
Learn the basics of FS
Read about insurance underwriting, banking margin, or asset management economics. You will not need to be an expert, but you cannot freeze on basic terms.
Train the skills Oliver Wyman actually tests
Mental math, case math, market sizing, MECE structuring, and framework recall, drilled in a single 5-to-10-minute daily session. No accounts, no onboarding, no fluff. The same practice that gets Oliver Wyman candidates ready for the case.
FAQ
Is Oliver Wyman really more quantitative than McKinsey?
For many candidates, yes. OW cases tend to involve more numbers and more layered calculations. Math benchmarks before the interview are useful.