How scoring works

Your raw score is real

Every answer is checked server-side against the verified key. The score you see is exactly correct ÷ total — nothing weighted, nothing massaged.

Weak areas are named, not guessed

The diagnostic covers all twelve areas real tests draw from. Each question carries named wrong-answer patterns (the specific mistake each wrong option encodes), so when you miss one we can tell you the area — and on free questions, the exact error — behind it.

The percentile is labelled — never invented

Real percentiles need real test-takers. Until we have 100 of our own, your percentile is computed against a seeded baseline cohort (n=200), a fixed, documented prior, and it is always labelled as such next to the number. It switches to real attempts the moment there are enough of them. We never display a percentile against a population that doesn’t exist.

Difficulty is computed

Each question’s difficulty tier (1–5) is computed from its structure — steps, lookups, number awkwardness, time pressure — and recalibrated from real solve data. It is never set by hand.