Work out exam normalisation score instantly with clear inputs, formula shown and shareable results.
Multi-session examinations normalise scores so candidates are not advantaged or disadvantaged by paper difficulty. Converting a raw score to a z-score within its session and re-expressing it against the overall mean removes the session effect while preserving relative standing.
Standard score
z = (Raw score - Session mean) / Session standard deviation
Normalised score
Normalised = Overall mean + z x Session standard deviation
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.
Because sessions differ in difficulty. Two candidates with identical ability can score several marks apart purely because of which shift they sat.
Methods vary — some use percentile equating rather than z-scores — but the principle of removing session difficulty is the same.