— GUIDE —
HOW TO PREPARE FOR QUANT ONLINE ASSESSMENTS
Quant OAs move quickly, and knowing the math is only half the job. Here is what tends to come up, how the clock changes your approach, and a two-week practice plan.
UPDATED 2026-08-12 · 8 MIN READ · BY THE VARIANCE TEAM
What is a quant online assessment?
A quant online assessment (OA) is a timed screening test that quantitative trading firms, market makers, and hedge funds send to candidates before human interviews. Most quant OAs test mental math speed, number sequences, probability, logic, and pattern recognition. Some questions give you seconds rather than minutes.
The OA is an early filter. It asks whether you can stay accurate when the clock is uncomfortable. Plenty of candidates know the underlying math but have never tried to retrieve it at speed. That gap shows up immediately.
What do quant OAs test?
Formats vary by firm, but nearly all quant OAs draw from the same five skill areas:
| Skill | Typical format | Typical pace |
|---|---|---|
| Mental math | Arithmetic: multiplication, division, fractions, percentages | 5–10 seconds per question |
| Number sequences | Find the next term in arithmetic, geometric, or recursive patterns | 15–45 seconds per question |
| Probability | Dice, cards, coins, expected value, conditional probability | 30–90 seconds per question |
| Logic puzzles | Deduction problems and brain teasers | 1–3 minutes per question |
| Pattern recognition | Visual or matrix patterns, odd-one-out | 15–30 seconds per question |
The most famous example is the math test popularized by market makers like Optiver, publicly described as 80 arithmetic questions in 8 minutes. That works out to six seconds per question, with penalties for wrong answers. Even OAs that are less extreme are built on the same principle: accuracy at speed. For a breakdown of how different firm types weight these skills, see what quant firms test in interviews and OAs.
How scoring usually works
Three details about scoring change how you should prepare:
- Wrong answers are often penalized. Many math OAs subtract points for incorrect answers, so guessing blindly is negative expected value. Know your accuracy rate before test day.
- You're scored against other candidates, not against an absolute bar. A merely average run may not be enough.
- Skipping is usually allowed and often correct. A question that takes you 40 seconds costs you five or six easier questions. Train yourself to bail out fast.
A two-week preparation plan
Two weeks of focused daily practice is enough to move your speed meaningfully if you train the right way. Use short, timed sessions every day. Arithmetic speed responds to repeated retrieval; a long cram session does little for it.
Days 1–3: Baseline and fundamentals
- Take a timed diagnostic in each category and record your accuracy and average time per question. This is your baseline.
- Refresh the arithmetic shortcuts you'll need on every question: multiplication tables through 20, squares through 25, common fraction–decimal–percentage conversions. Our mental math guide covers the core techniques.
Days 4–9: Volume at the edge of your speed
- Two or three 15-minute timed sessions per day, each session focused on one skill area. Push pace until your accuracy drops to roughly 85–90%, then hold there. That is fast enough to expose weak recall without turning the drill into random guessing.
- Alternate strong and weak categories. Most candidates over-practice what they're already good at.
- Work through mixed practice questions with worked answers to learn the recurring patterns in sequences and probability.
Days 10–13: Full simulations
- Run full-length timed simulations under real conditions: no pauses, no scratch calculator unless the OA explicitly allows one.
- Practice your skip discipline: set a hard time budget per question and move on when you hit it.
- Review every miss and classify it: knowledge gap, careless slip, or time pressure.
Day 14: Taper
Do one light session to stay warm, then leave it alone. Another late practice set is a poor trade if it costs you sleep.
Test-day execution
- Warm up first. Do 5–10 minutes of easy arithmetic before opening the OA, the same way you'd warm up before a race.
- Answer the first few questions deliberately. Early questions are usually easier; banking accurate points beats a fast start with two misses.
- Never dwell. If a sequence doesn't reveal its pattern in your time budget, skip. Unanswered beats wrong when penalties apply.
- Use a stable setup: desktop over laptop trackpad, wired internet if possible, phone away, full screen.
The mistakes that cost offers
- Practicing untimed. Untimed practice builds knowledge, not speed. Every practice session should have a clock on it.
- Cramming the night before. Speed is built over days and weeks. A tired brain is a slow brain.
- Ignoring the penalty structure. Guessing on a penalized test is how strong candidates end up with mediocre scores.
- Treating the OA as a formality. At most quant firms, the OA eliminates the majority of the applicant pool. It is the interview.