Look for method marks
A mark scheme often separates the route from the final answer. That distinction helps identify whether the issue was starting, choosing a method, or carrying out the calculation.
Oxbridge Math Tutors IGCSE & A-Level · Mark-scheme resource
A mark scheme is evidence, not a method to copy.
A plain-language guide to IGCSE and A-Level maths mark schemes, including method marks, accuracy and question-specific follow-through.
Read the conditions
Correct answers can still depend on units, notation, rounding, or a stated assumption. These details reveal what the question is actually asking the student to control.
Turn feedback into a next move
The useful question is not only “how many marks were lost?” It is “what should the student do differently when the question changes shape?”
Mark schemes
M, A, B marks and follow-through
M marks
Method marks reward a valid attempt at the required approach, even if later arithmetic slips.
A marks
Accuracy marks usually depend on the relevant method mark being earned.
B marks
Independent marks for a correct result or statement not tied to a method.
Conditional follow-through (ft)
Some questions allow a mark for correct work following an earlier error. The guidance is written per question and board.
When working is required
A correct answer can imply method in many questions. Show that, prove, and questions that demand a specified method require the evidence to be shown. Valid alternative methods are normally accepted unless a method is demanded. Read the board’s own mark scheme rules.
Worked mark example
Minimum point of a quadratic
Find the coordinates of the minimum point of y = 3x^2 - 12x + 5.
- Differentiatedy/dx = 6x - 12M1 for an attempt to differentiate; A1 for correct
- Set to zero6x - 12 = 0, so x = 2M1 for setting dy/dx = 0 and solving; A1 x = 2
- Find yy = 12 - 24 + 5 = -7A1ft for y from their x, if the substitution is correct
- Justify the minimumThe coefficient of x^2 is positive, so the parabola opens upwards. Its stationary point (2, -7) is the minimum.
Illustrative only. Mark codes, allocation and follow-through wording differ across boards and questions. Completing the square would be an acceptable alternative here unless the question demanded calculus.
Official sources
Course guidance reviewed in October 2026. Confirm the rules for your own exam session with the school and awarding body.
Questions parents ask
Does no working mean no marks?
Not always. Some answers earn marks without working, but show-that, proof and demanded-method questions need the evidence.
Will a method from another board lose marks?
Valid alternative methods are normally accepted unless the question demands a method.
Is IGCSE the same as GCSE?
No. They are different qualifications; identify yours exactly.