Quality
How we check every question
AI agents draft our questions. Before a question is sold it has to pass seven checks, and when someone finds a mistake we fix it in public.
The seven checks
- Source. Every code reference is checked against the edition the exam uses. Where a section number changed in a new edition, we say so.
- Arithmetic. Every numeric answer is recomputed by code, and the rounding rule is written into the solution.
- Distractors. Each wrong option comes from a real, common mistake, such as using last edition's value or skipping the 125% factor.
- Blind second solve. A second model that did not write the question solves it without the answer key. Any disagreement holds the question back.
- Expert review. A named professional who passed the exam reviews the content. Until that happens we say so on the page.
- Copyright. We do not reproduce code text, tables or figures, and we never use recalled exam questions.
- Corrections. Every reported error is reviewed within 72 hours, and every fix is listed below.
Corrections log
No corrections yet. This log starts on 14 October 2026. Each entry will show the date, the question ID, what was wrong and what we changed.