The Marking Team
GCSE maths marking is not random. Every paper goes through a structured quality chain before a mark appears on your certificate. Senior examiners write the mark scheme in the months before the sitting — not as an afterthought, but as a tightly specified document that governs every mark awarded. Principal examiners then run standardisation meetings with the marking team, where actual student responses from early marking are used to calibrate everyone's judgements. Markers who deviate from the standard are retrained or removed. Throughout the marking window, a percentage of completed scripts are re-marked by senior examiners as a quality audit. If your script is flagged, the whole thing gets reviewed. This is why marker inconsistency, while it exists at the margins, is much rarer than students believe. The bigger variable is not the marker — it is the student's script.
Method Marks vs Answer Marks
The mark scheme divides most marks into three types, each with its own letter code. M marks are method marks: you earn them by showing a correct mathematical approach, regardless of whether your final answer is right. A marks are accuracy marks: they are awarded for the correct answer following correct working — in most cases you need the preceding M mark first. B marks are independent accuracy marks: they stand alone and do not require a method mark. They appear most often on short, single-step questions where there is no meaningful method to reward. Here is why this matters in practice. Suppose a question asks you to solve x² + 5x + 6 = 0 and you correctly factor it as (x + 2)(x + 3) = 0. That step earns an M mark. If you then state x = -2 or x = -3, that earns the A marks. But if you wrote (x + 2)(x + 3) = 0 correctly and then made an arithmetic slip reading off the solutions — writing x = 2 or x = 3 — you would lose the A marks but keep the M mark. One error costs you one mark, not the whole question. Many students abandon a question the moment they sense they have gone wrong. That is the single most expensive habit in an exam. Partial credit exists precisely because the mark scheme separates method from answer.
Follow-Through Errors
Follow-through (abbreviated ft or FT in mark schemes) is one of the most important concepts in GCSE marking, and one of the least understood by students. If you make an error in part (a) of a question and carry that wrong answer into part (b), the examiner marks the mathematics in part (b) — not the number. If your method in part (b) is correct given your (wrong) answer from part (a), you still earn the method marks. The examiner is asking: did this student know how to use the value they had? The underlying principle is straightforward: examiners want to reward mathematical understanding, not punish a single slip twice. A common example appears in probability trees. If you calculate an incorrect probability in part (a) — say you write 0.4 instead of 0.6 — but then correctly multiply your branches in part (b) using 0.4, you will receive the method marks in part (b). The answer will be wrong, but the method was applied correctly to the data available. This is not a loophole. It is how the mark scheme is designed. The implication for students is significant: always attempt every part of every question, even if you think an earlier part was wrong. Your wrong answer from part (a) becomes your working value for part (b), and correct use of it still earns marks.
Quality of Written Communication
On questions worth four or more marks, many exam papers include one or two marks specifically for quality of written communication. These are not vague marks for neatness. They are awarded for specific things: showing all steps of a calculation rather than leaping to an answer, labelling answers with appropriate units (cm², m/s, £), and presenting the solution in a logical sequence that another reader could follow. The most common way students lose QWC marks is by writing a correct answer with no visible working. If you can do quadratic formula calculations in your head, you still need to write out the substitution. If you work out a bearing, you need to label the diagram. Examiners cannot award marks they cannot see. On a Higher paper, QWC marks typically appear on the algebraic proof question, the geometry question, and longer statistics or ratio problems. Spotting them is straightforward: look for the command word 'show that' or 'prove', or check the mark allocation — questions with an odd number of marks often have a built-in QWC mark.
What Examiners Actually Look For
Examiner reports, published after every sitting, are remarkably consistent year on year. The same issues appear repeatedly. Accuracy is the first: unless a question specifies otherwise, answers should be given to three significant figures. Writing 3.14 when the answer is 3.14159... is fine; writing 3.1 is not. Units are the second: a question asking for an area expects cm² or m², not just a number. A speed question expects m/s or km/h. Diagrams are the third: if you draw a geometric construction or a triangle, label it. Unlabelled diagrams cannot earn marks that depend on the diagram. Completeness of method is the fourth: every step that earns a separate mark needs to be visible. If you used Pythagoras, write a² + b² = c². If you used the cosine rule, write it out before substituting. The examiner is not checking whether you know the formula exists — they are checking whether you applied it correctly.
- Accuracy: 3 significant figures unless the question specifies otherwise
- Units: always include them — cm², m/s, £, kg — on every numerical answer
- Diagram labelling: angles, lengths, and points must be labelled to earn diagram marks
- Full method visible: write every step that corresponds to a separate mark in the scheme
Common Marking Misconceptions
Two persistent myths cost students marks every year. The first is that crossing out working means losing those marks. It does not. If you cross out working and replace it with something different, the examiner marks the replacement. If you cross out working and write nothing in its place, the original working may still be considered — particularly if it shows a correct method. Cross out only when you genuinely intend to replace the working, and always replace it. The second myth is that rough working in the margin does not count. It does. If your rough working in the margin shows a correct method that is not visible in your main working, a senior examiner reviewing your script can — and often will — award the method mark. Write rough working in the booklet, not on scrap paper. Scrap paper is not submitted.
How to Use This in Revision
Understanding the marking system changes how you practise. First, always show working — not because teachers tell you to, but because working earns marks independently of the answer. Second, get hold of mark schemes and read them. After attempting a past paper question, compare your working line-by-line with the mark scheme, not just the final answer. Learn what earns each mark. Third, attempt every question on every paper. A zero on an unattempted question is guaranteed. A partially correct attempt earns method marks. Fourth, practise presenting your working in a logical sequence rather than circling answers with no method shown. A script that guides the examiner through your reasoning earns more marks than one that presents answers with no context. Take the free diagnostic quiz to find out which topics are your current priority areas — then bring mark scheme awareness to your practice on those topics specifically.