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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -386,6 +386,18 @@ Structured practice across probability, brainteasers, and role-specific prep

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#### Quant Sprint
👉 https://lambdia.com/play

Timed first round drill where every question is a drawing rather than a paragraph

**How to use it:**
- Use it for speed under a clock, not for learning a topic from scratch
- Covers options and the Greeks, two sided quoting, probability, and mental arithmetic
- Free, runs in a browser, no account needed

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### ⚡ Mental Math

#### Zetamac
Expand Down Expand Up @@ -1239,6 +1251,7 @@ Usually some combination of:
- **Jerry Qin** → probability prep
- **LeetCode** → coding
- **Zetamac** → mental math
- **Quant Sprint** → timed first round drill (options, quoting, probability)

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