After thousands of logged practice attempts, the same errors repeat across every subject. Here are the top 10 CSCA mistakes ranked by how many points they cost — and the exact fix for each, mapped to the free tools that solve it. The costliest is pacing collapse — the full fix lives in the 75-second rule guide.
The 10 costliest mistakes
- 1. The 3-minute sinkhole: one stuck question eats two easy ones. Fix: 2-minute cap, flag, move.
- 2. Answering the expected question: misreading stems under time pressure. Fix: underline the actual ask.
- 3. Blank formulas: reaching mocks without memorizing core ones. Fix: formula book + spaced recall.
- 4. Calculator hands: decimal long-division habits with no calculator allowed. Fix: mental-math drills.
- 5. Unit blindness: answers off by 10³ with no check. Fix: 10-second unit check on every numerical answer.
- 6. Blind-bank trust: training on mistranslated questions harder than the real paper. Fix: calibrate on previous papers.
- 7. Whole-textbook study: equal time for 4%-weight topics. Fix: weight-ordered topic list from diagnostics.
- 8. Mockless preparation: zero full timed rehearsals before exam day. Fix: minimum 3 full mocks.
- 9. Unreviewed errors: repeating the same miss three mocks running. Fix: mistake log cleared weekly.
- 10. Admin failure: wrong software, missed system test, late login. Fix: registration checklist routine.
The system that kills all ten
Diagnose, drill weak high-weight topics timed, mock full papers, clear every error by cause, repeat. That loop runs automatically across the diagnostic, practice bank, mocks and Mistake Book — with readiness tracked on the progress dashboard. And #10 (admin failure) has its own registration checklist.
What is the biggest CSCA score killer?
Pacing collapse: overspending on hard questions then rushing easy ones. The 2-minute cap plus the 4-phase paper strategy fixes it.
How do I stop repeating the same mistakes?
Log every error with its cause and re-solve it cold a week later. Errors that survive two reviews need a concept lesson, not more drills.
Are third-party CSCA question banks reliable?
Mixed: some run harder than the real paper or carry translation errors. Calibrate difficulty against previous papers and prefer banks that mark disputed questions. Background on why style shocks even strong students: the difficulty guide.
