Practical guides for tutors marking A-level & IGCSE maths — by the mark scheme, point by point.
📄 Free: the Maths Mark-Scheme Decoder (M/A/B, oe, cao, ft…) →
What method, accuracy and independent marks actually mean — and how to award them consistently.
Where marking time really goes, and the methods that speed it up without losing per-step rigour.
How the three boards differ on method, accuracy and follow-through — and why it matters when you mark.
Which steps earn the M and A marks, the slips that lose accuracy marks, and how follow-through applies.
Method vs accuracy across factorising, the formula and completing the square — and the slips that cost marks.
The M/A marks for indefinite & definite integrals, the +c mark, limits, and the slips that cost accuracy.
Why students lose half the marks even with a correct angle — missing solutions in range, degrees vs radians.
The M/A marks for log laws and solving exponential equations — and the exact-vs-decimal slips that cost marks.
Coefficients, powers, signs and the validity condition — where the method mark holds but accuracy leaks.
Position vectors, magnitude, the dot product, and the "common point" line students forget on "show that".