CSCA admission exam · Mathematics & Physics
Practice for the CSCA exam.
Every wrong answer, explained.
Timed 48-question mocks, 880 verified questions, and — when you miss one — the specific misconception behind it. Built by a student who is sitting the exam too. Free.
01Try one
A question, before you sign up for anything.
Pick an answer — or press A–D.
Three real items from the bank, one per difficulty band. Everything you see after answering — the named mistake, the path that produces it, the worked solution — is what the app shows on every question.
02The exam
What you're sitting.
48
questions
multiple choice
60
minutes
about 75 seconds each
100
points
no penalty stated
4
options
exactly one correct
Mathematics
share of the 48 questions- Sets & Inequalities
17% · 8 questions - Functions & Sequences
33% · 16 questions - Geometry & Algebra
29% · 14 questions - Probability & Statistics
21% · 10 questions
Target difficulty per paper: 19 easy · 15 medium · 14 complex — the official 40 / 30 / 30 split.
Physics
share of the 48 questions- Mechanics
29% · 14 questions - Electromagnetism
25% · 12 questions - Optics
17% · 8 questions - Modern Physics
17% · 8 questions - Thermodynamics
13% · 6 questions
Same 48 / 60 / 100 shell. No calculator, and every constant you need is printed in the question.
From the official syllabus and guidebook, cross-checked against real practice papers.
03What's inside
Every item verified. Every miss named.
- Question bank
- 880 published questions — 320 Mathematics, 560 Physics. All original, written to the blueprint's module weights and difficulty cells. Small, and growing.
- Misconceptions
- 493 named misconceptions, 181 in Maths and 312 in Physics. Every wrong option on every question is tied to one, together with the short derivation that produces that exact wrong value.
- Verification
- 744 of the 880 have had their answer key and every distractor re-derived by a symbolic-math engine: a wrong option has to be precisely what its mistake produces, or the item is discarded rather than patched. The remaining 136 were written before that gate and are being re-checked.
- Review
- A misconception you miss comes back as fresh questions on a spaced schedule (FSRS). It's retired only once you've beaten it on three distinct questions.
- Mocks & drills
- Full 48-question, 60-minute papers with a score estimate and a per-module breakdown. Also 12-question mini mocks, timed speed drills, and focus packs built from your weakest modules.
- Reference
- Learn notes for every topic, a formula and exam-day sheet, and a printable notebook of your own mistakes.
04Why it exists
A student project, not a company.
I'm preparing for the CSCA myself. What I could find was either paid, or free and calibrated wrong — question banks much harder than the real exam, which mostly taught me to doubt my own preparation.
So I built the thing I wanted: questions written to the real blueprint, an answer key a machine has checked, and every mistake explained by why it happened rather than just marked red.
It's free because it's a side project, not a business. Letting one more person use it costs me close to nothing, and there's nothing to upsell. If you're sitting the CSCA, it's yours.
05Start
Keep your mistakes.
Sign in with a code sent to your email and your misses are remembered — they keep coming back until they stop happening.
Sign in →Set in Cormorant Garamond, Spectral and Inter, with 马善政 for the seal. The 水墨 paintings and the 宣纸 ground were made for this app. Built with Next.js, Postgres and KaTeX; items verified with SymPy.