How does the Exam Simulator work?

You pick a subject, then get five questions and 45 seconds each. During the run you do not see the correct index or the explanation. That is intentional — it is a practice exam, not Quiz Me.

When time runs out, the unanswered item is marked wrong. The server compares your answers to the stored key, writes an idempotent attempt, updates proficiency, and only then returns explanations.

The simulator unlocks at Navigator and on paid plans. Free accounts see an upgrade message. Younger stages are redirected home.