When your child sits a GCSE paper, several layers of quality control determine the final grade — from the first examiner who reads the script to a national statistical process that sets grade boundaries. Understanding how marking and moderation work helps parents make sense of results, appeals, and grade changes.
Who marks GCSE exam papers?
GCSE exam scripts are marked by examiners employed by the four main exam boards in England: AQA, Pearson Edexcel, OCR, and WJEC. These examiners are predominantly practising or former teachers, recruited and trained specifically for the marking season. The process works as follows:
- Principal examiners write the mark scheme — a detailed document specifying what a correct or creditworthy answer looks like.
- Senior examiners train a team of examiners, using sample scripts to agree on how the mark scheme should be applied consistently.
- Assistant examiners mark the bulk of scripts. Each examiner is allocated a portion of the national entry and must pass a standardisation check before marking begins.
- Team leaders monitor examiner accuracy through the season and flag scripts for re-marking if an examiner drifts from the agreed standard.
Most written papers are now marked on-screen rather than from physical scripts. Scans of handwritten answers are distributed electronically to examiners working from home or in marking centres.
What is the difference between marking and moderation?
Marking and moderation address different parts of the GCSE process:
| Process | What it covers | Who does it |
|---|---|---|
| Marking | Written exam papers — assigning a raw score to each answer | Exam board examiners |
| Standardisation | Ensuring all examiners apply the mark scheme identically | Senior examiners and team leaders |
| Moderation | Checking that teacher-assessed work (coursework/NEA) is graded consistently across schools | External moderators appointed by the exam board |
| Grade boundary setting | Converting raw marks into GCSE grades (1–9) | Exam boards using statistical evidence and senior examiner judgement |
The key distinction for parents is that written exams are marked by the exam board, while coursework and non-exam assessment (NEA) are graded by the school teacher first and then checked by an external moderator.
How are grade boundaries set?
Grade boundaries are not fixed in advance. They are set after the exams, based on:
- Statistical evidence from prior years, to maintain comparability
- Examiner judgement about where the boundary for each grade should fall, using key papers as reference points
- Ofqual oversight to ensure the overall national picture is consistent with previous cohorts
This means that a student who scores, say, 68 marks on a paper might receive a grade 7 in one year and a grade 6 in another, depending on where the exam board sets the boundary. The mark is consistent; the boundary moves. Parents often find this counterintuitive — but it is the mechanism that ensures a grade 5 in 2026 represents the same standard as a grade 5 in 2023.
What is standardisation and why does it matter?
Standardisation is the process by which exam boards ensure every examiner is applying the mark scheme in the same way. Before marking begins, all examiners:
- Study the mark scheme and chief examiner guidance
- Mark a set of pre-graded "seed" scripts
- Have their marks checked against the correct answers
- Are only allowed to proceed if their scores match closely enough
During the marking season, additional seed scripts are embedded in each examiner's batch without their knowledge. If an examiner consistently mismarks these, their entire workload may be withdrawn and re-allocated. This is the system that catches examiner error before it reaches results day.
How is coursework and NEA moderated?
Coursework — now usually called non-exam assessment or NEA — is initially marked by the student's own teacher. To prevent different schools awarding different marks for equivalent work, exam boards moderate each school's results:
- The school submits a sample of marked NEA work to the exam board's moderator.
- The moderator reviews the sample and decides whether the teacher's marks are accurate, too generous, or too harsh.
- If an adjustment is needed, it is applied consistently across the whole school cohort — not just the sampled students.
This is why a student can sometimes see their coursework mark change between the school's reported mark and the final result — the moderation process has shifted the whole school up or down.
What happens when a school requests a remark?
After results day, schools or individual students can request a review of marking. The formal process is called a post-results service and works in stages:
- Priority Service 1 (PS1): The script is checked for clerical errors only — missing marks, addition errors, unchecked pages. Faster and cheaper.
- Priority Service 2 (PS2): A senior examiner re-marks the script. This can result in the grade going up, staying the same, or going down.
The school pays a fee for the service, which is refunded if the grade changes. Remark timelines are tight — applications typically close within a few weeks of results day.
Frequently asked questions
Can my child's GCSE grade go down after a remark?
Yes. A senior examiner re-marking a script may award a lower score than the original. This is rare but it does happen — particularly if the original examiner was generous on a borderline script. Parents should weigh this risk carefully before requesting PS2 for a grade that is only marginally below the desired level.
Who trains the examiners who mark my child's papers?
Training is run internally by each exam board. Examiners must have relevant subject expertise — usually a degree in the subject or teaching experience — and must demonstrate consistency with the mark scheme before being approved. Exam boards are regulated by Ofqual, which sets standards for examiner quality assurance.
Why do grade boundaries change every year if the course content stays the same?
Boundaries shift to reflect the difficulty of each paper and to maintain comparability with previous cohorts. If a paper turns out to be harder than intended, the boundary for grade 5 may be set lower than it was the year before, so that the same level of knowledge receives the same grade. The process is called comparable outcomes and is overseen by Ofqual.
What if I think the marking scheme was unfair, not just incorrect?
A remark checks whether the mark scheme was applied correctly, not whether the mark scheme itself was appropriate. If you believe the mark scheme was poorly designed or led to systematically unfair outcomes, that concern should be directed to Ofqual, the qualifications regulator, rather than to the exam board's post-results team.
For subject-by-subject GCSE support from AI tutors who know the mark schemes inside out, visit aitutors.me.