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How To Quant teaches Xinfeng Zhou's A Practical Guide to Quantitative Finance Interviews through daily streaks, AI hints, and a reasoning workspace. The way the book deserves to be taught.
No credit card. No subscription. No ads, ever.
Drag to rotate. Scroll to zoom. Hover the surface to read Δ, Γ, Θ, ν in real-time. This is the kind of interaction the green book deserves — and the kind you'll see on every chapter.
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Xinfeng Zhou's green book is the closest thing the industry has to a standard. 140 problems across 11 sections — brain teasers, calculus, probability, stochastic calculus, options, algorithms, numerical methods.
One new problem per day. Complete it (or give up — resets nothing but your pride) to unlock tomorrow's. Miss a day, lose the streak. No streak freezes. That's the deal.
Free gets you the daily problem-unlock flow. £5 lifetime unlocks all 140 instantly, plus 30 harder extras (still daily-paced) and the gratitude of The Woo.
No subscriptions. No tiers. No ads, ever. £5 unlocks every problem instantly, plus 30 harder extras.
See what £5 gets you →I once watched a candidate fail the birthday paradox in a final-round Jane Street interview. Don't be that candidate.
The Woo · 4 min read
Xinfeng Zhou's book isn't perfect, but it's the canonical quant interview prep. Here's why.
The Woo · 4 min read
What Jane Street actually asks. Hard math, fast, in person.
The Woo · 5 min read
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