PRACTICE
Pick the seat you're
trying to sit in.
Guesstimates and cases sorted by the job they prepare you for, not by a generic difficulty ladder. A product root-cause question and a consulting profitability case are not the same skill, so they don't live in the same pile.
Strategy & Consulting
Market sizing and resource estimation. Profitability, entry, growth, M&A and pricing cases.
Product
Scale and usage estimation. Root cause, product design, metrics and prioritisation cases.
Finance
Revenue and book sizing. Valuation, invest-or-not, capital structure and unit economics.
Marketing & Brand
Category sizing, reach and spend. Go-to-market, positioning, share loss and channel mix.
HOW A QUESTION WORKS
Read and start the clock
Every question carries the time box it was actually asked in.
Write your assumptions
Assumptions, working, answer. Kept separate, because that is how it gets marked.
Compare with the approach
Not a single right number. The structure a strong answer follows, and where the number lands.
Take it to a mentor
Bring your working to a call with someone who has been asked this for real.