A mock and a real GCSE are governed by two entirely different documents when a student misses one -- this guide keeps them apart.
Book a Free ConsultationA missed GCSE mock triggers no exam-board process at all: Ofqual's guidance tells the school only to mark the assessment as normal and record what happened, at the school's own discretion. A missed real GCSE is different -- it falls under JCQ's special consideration rules, which estimate a missing mark from a candidate's other papers once at least 15% of the assessment has been completed. Confusing the two is the single most common mistake a parent makes.
A missed mock is a gap in the evidence, not a verdict on the subject.
Our expert GCSE tutors build a plan around exactly what a school still needs to see, on any of the four exam boards, whether the immediate problem is a missed paper or the revision that follows it.
Book a Free Consultation Message us on WhatsAppNo exam board is involved when a student misses a GCSE mock, and that surprises most parents. The document that actually governs a missed mock is Ofqual's guidance on collecting evidence of student performance to ensure resilience in the qualifications system, last updated 4 March 2025. It was written to make sure schools hold real assessment evidence in case exams are ever cancelled nationally again. Mocks are usually the assessment schools use to meet that requirement, which is why the guidance ends up governing what happens when one is missed. Whether a mock is compulsory at all is a separate question with a clearer answer.
Its instruction for a student affected by illness or another event outside their control is direct: the teacher should “mark the assessment as normal but record the issues so that these could be taken into account when determining a grade, should that be necessary.” Two things follow. First, there is no separate percentage, form or national process for a missed mock – nothing like the machinery that governs a missed real exam. Second, the decision belongs to the school. Ofqual sets the principle; each centre applies it in its own way.
That also means the guidance asks the school to act, not to produce a document a parent can request on demand. If a school says a missed mock “doesn't count for anything,” that describes their own discretion, not a rule Ofqual has set. It is worth asking, directly, what has actually been recorded.
In practice, three things happen, all set out in the same Ofqual guidance. First, the assessment is marked as normal for whatever the student did attempt, with no automatic boost for the missed portion. Second, the circumstances are recorded, so that if the mock is ever needed as formal evidence – in the unlikely event that real exams cannot go ahead – the school can show why that result should be read differently. Third, the guidance expects the student to have raised it promptly: “Centres should make sure students know they need to tell their teachers before, or immediately after, the assessment of any events outside of their control that might have affected their performance.”
What "record the issues" looks like day to day is not standardised. One school might log it against the student's file; another might simply note it in a mark book. Neither is wrong, because nothing in the guidance specifies a format – it specifies an outcome, and leaves the mechanism to the centre.
The same document caps how much mock evidence a school is expected to hold at all: “one set of mocks for this purpose should be sufficient,” and teachers “should guard against over-assessment.” Our guide on whether a mock paper can come home covers this same document's rules on retaining and returning the physical script – a different question about the same guidance.
Three steps, in order, all grounded in what the guidance actually asks for rather than general advice.
Tell the school before the missed assessment, or immediately afterwards. This is not a courtesy – it is the guidance's own instruction, and a school that only learns about an illness a fortnight later has a harder case for recording it as an event outside the student's control at the time.
Ask specifically what has been recorded, and for which subject. “We've noted it” is not the same as knowing whether a note sits against one paper or the whole mock series. Given that nothing is standardised between schools, the only way to know what a school has actually done is to ask.
Ask whether a catch-up sitting is planned, and if not, why. Some schools offer one as a matter of course; others do not, particularly once the rest of the cohort has already sat the paper. Either answer is legitimate, but it changes what evidence exists for that subject going into the rest of the year.
If a school does offer a catch-up sitting, Ofqual's guidance sets a real constraint on how it has to be run, and it is one almost no other source mentions. Students sitting an assessment for this purpose “should not know the questions in the assessment beforehand,” and the guidance goes further on the practical problem this creates when one student sits a paper after the rest of the year group already has: “Wherever possible, a centre should either assess all of its students who are taking a particular qualification using the same material at the same time or using different materials at different times. Where this is not possible, centres should seek to ensure that students are not able to predict the materials they are going to be assessed on.”
In practice this leaves a school with two honest options for a solo catch-up sitting: set a genuinely different paper, or manage the original paper's security carefully enough that a late sitting is not simply a test of what classmates have already told the student. Neither is a formality. A catch-up mock sat under conditions where the questions are already known is not evidence of anything – which is exactly the failure this rule exists to prevent, since the whole point of the guidance is to keep mock results usable as real evidence later.
Everything above governs a mock. A missed real GCSE is governed by an entirely different body of rules: the Joint Council for Qualifications' own guide to the special consideration process, effective from 1 September 2025. The word “mock” does not appear anywhere in it. Two separate mechanisms sit inside it, depending on whether the student attended the exam at all, and conflating them is where most of the wrong figures circulating online come from.
A catch-up sitting only helps if the weeks before it are used well.
Our GCSE tutors work one to one on the specific topics a missed mock or paper covers, so a catch-up sitting, or the next real exam, reflects what a student actually knows.
Book a Free Consultation Message us on WhatsAppIf a student attends the exam but their performance is affected – unwell but present, distracted by something happening at the time – the centre can apply for an allowance of additional marks on the affected component. JCQ's guide caps this at 5%: “The maximum percentage given will be 5% of the total raw marks available in the component concerned, including coursework or non-examination assessment.”
That maximum is a ceiling, not a typical outcome. Ordinary illness on the day sits in JCQ's most common band, adding 2%, not 5% – and the allowance “cannot be applied in a cumulative fashion,” so a bereavement and a viral illness on the same day do not add together. JCQ's five bands:
| Band | Example circumstances |
|---|---|
| 5% (max) | Terminal illness; death in immediate family within 3 months |
| 4% | Life-threatening illness; major surgery near the exam |
| 3% | Serious recent illness or injury; flare-up of a long-term condition |
| 2% (most common) | Illness at the time of the exam; concussion |
| 1% | Hay fever; minor administrative problems |
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This is the mechanism that applies when a student misses a whole paper, and it works nothing like a percentage bonus. JCQ's guide sets a completion threshold first: for a GCSE taken with AQA, OCR, Pearson or WJEC, “one whole component, which is a minimum of 15% of the total assessment, must have been completed.” That 15% is not marks added to a result – it is the minimum a student must already have sat elsewhere before an estimate is even possible. Miss everything in a subject, and there is nothing to estimate from; the student re-sits in a future series instead.
A figure of 25% is widely repeated for this threshold. JCQ's guide states the 15% floor for AQA, OCR, Pearson and WJEC GCSEs, and separately: “For CCEA GCSE qualifications, 25% of the GCSE qualification must have been completed.” CCEA is Northern Ireland's exam board – the 25% figure is real, but belongs to a different jurisdiction, not to a GCSE sat with any of the four boards used across England.
Once the threshold is met, the missing mark is calculated using what JCQ calls the z-score method: the gap between a student's mark and the average on the paper they did sit is assumed to hold, in relative terms, on the paper they missed. JCQ's own worked example makes this concrete. On one component the average mark is 53 with a standard deviation of 5; a candidate absent from a second component (average 34, standard deviation 3) scored 43 on the first – 10 marks, or 2 standard deviations, below average. Applying the same 2 standard deviations to the missing component gives an estimate of 34 − (2 × 3) = 28. No mock result appears anywhere in this calculation – the estimate is built entirely from the student's other real GCSE papers in the same specification.
One further point several otherwise careful guides get wrong: formal medical evidence is not always required. JCQ's guide gives a worked scenario of a student who misses a GCSE exam, her mother phoning the school that morning to report a stomach upset with no medical evidence available. The centre's response is to have the parent complete a short form – JCQ calls it Form 14/JCQ-ME – rather than insist on a doctor's note the family may not be able to produce in time. A fit note strengthens an application; it is not always the only route to one.
Indirectly, yes. A predicted grade and, where a subject is tiered, a tier decision both draw on whatever assessment evidence a school holds – and a missed mock is one fewer data point than the school would otherwise have had. Nothing about the missing evidence disappears; the decision just gets made with less of it, which is why the practical steps above (a catch-up sitting where one is offered, making sure the school has recorded the reason) are worth acting on rather than waiting out.
Timing matters. For the June 2027 GCSE series, Pearson's own key-dates document lists a GCSE entry deadline of 21 February 2027, with amendment fees from 22 April 2027; OCR's 2026-27 schedule lists the same 21 February 2027 entries deadline, with its own fee stages from 22 February 2027 and a final entry-amendments deadline of 12 August 2027. Neither board publishes a date after which a tier can no longer be changed at all – only fee stages. In practice, the real deadline is a conversation with the school's exams officer, held before entries are finalised.
Special consideration and access arrangements are two different JCQ mechanisms, and it matters which one applies. Special consideration, covered above, is applied after the fact, to a student who was disadvantaged by something on or near the day of an assessment. Access arrangements – extra time, a reader, a scribe – are arranged in advance, and a mock is frequently the evidence a school uses to support that advance application. If the concern is really about extra time rather than a missed sitting, our guide on extra time in GCSE mocks covers the deadlines and the evidence a school actually needs to submit.
A special consideration estimate is built from a student's other papers.
Our expert GCSE tutors focus revision on the remaining papers in a specification, on any of the four exam boards, so the marks any estimate would be built from are the strongest they can be.
Book a Free Consultation Message us on WhatsAppSome students miss a mock because they are physically unwell. Others miss it because they could not face going in – a panic attack that morning, or dread that built for days beforehand and won. Ofqual's guidance does not distinguish between these causes: it applies to any event outside a student's control at the time of the assessment, and a school has no reason to treat the second case as less legitimate than the first, provided the circumstances are genuine.
The practical consequences are identical either way, and they are real. Whatever kept a student out of the room, the evidence gap for that subject is the same size, and the downstream effect on a predicted grade is the same. Treating an anxiety-related absence as something to quietly wait out, rather than raise with the school in the way described above, leaves that gap unaddressed for no good reason. The steps that help are not different for illness versus anxiety – only the conversation about what caused the absence is.
Timing affects how much a missed mock actually matters, because it changes how much runway is left before real exams. Most schools run a first Year 11 mock round in the autumn term and a second later in the year, and a student who misses an early mock still has most of the academic year of evidence-gathering ahead, while one who misses a later round has considerably less. Our guide to when GCSE mocks actually happen sets out the full calendar for both rounds, including how the timing varies school to school.
Nothing happens at exam-board level, because no exam board is involved. Ofqual's guidance on collecting evidence of student performance tells the school to “mark the assessment as normal but record the issues so that these could be taken into account when determining a grade, should that be necessary.” There is no percentage, no form, and no national process -- the school decides what happens next, including whether to offer a catch-up sitting.
Not directly. A mock grade never appears on a GCSE certificate and is never combined with real exam marks -- there is no mechanism that carries a mock result forward into a final grade. What a missed mock can affect is the evidence a school holds for predicted grades and, in some schools, a tier decision, both of which draw on whatever assessment evidence exists, mock results included, so the effect is indirect rather than automatic.
This is covered by JCQ's special consideration process, set out in its guide effective from 1 September 2025. Two different routes apply depending on whether the student attended: a student present but disadvantaged by illness may have up to 5% of raw marks added to that component; a student absent from one paper may have the missing mark estimated from their other papers, provided they completed at least 15% of the total assessment elsewhere.
No, and this is the most common mix-up. The 15% figure is not marks added to anything. JCQ's guide states that for a GCSE with AQA, OCR, Pearson or WJEC, “one whole component, which is a minimum of 15% of the total assessment, must have been completed” before a missing component's mark can be estimated at all. It is an eligibility floor, not a bonus.
5% of the total raw marks available in the affected component, and JCQ's own guide describes that figure as “the maximum percentage” and says it will be “reserved for the most exceptional cases,” such as a terminal illness or a death in the immediate family within three months of the exam. Ordinary illness on the day of the exam falls into JCQ's most common category, which adds 2%, not 5%.
JCQ's z-score method compares the student's mark on the paper they did sit against the average for all candidates, then applies the same gap to the missing paper. JCQ's own worked example: a candidate scores 43 on a component with a mean of 53 and a standard deviation of 5 -- 2 standard deviations below average -- and the missing component has a mean of 34 and a standard deviation of 3, so the estimate is 34 minus (2 times 3), which equals 28.
Only for Northern Ireland. JCQ's own guide states the 15% completion threshold for GCSEs taken with AQA, OCR, Pearson or WJEC, and separately states that “for CCEA GCSE qualifications, 25% of the GCSE qualification must have been completed.” A figure of 25% is widely repeated online but is the Northern Ireland variant, not the one that applies to a GCSE sat with an England-based board.
It can, because a predicted grade and a tier decision both draw on whatever assessment evidence a school holds, and a missed mock is one fewer data point than the school would otherwise have had. Neither JCQ nor Pearson publishes a date after which a tier can no longer be changed at all -- only fee stages -- so the practical deadline is a conversation with the school's exams officer, held before entries are finalised.
Not to the process. Ofqual's guidance applies to any event outside a student's control at the time of the assessment, and a school applying its own discretion under that guidance does not need the reason to be physical illness specifically. What matters afterwards is the same regardless of cause: whether the school has recorded the issue, and whether a catch-up sitting or extra support is offered.
Our expert GCSE tutors work from exactly the evidence gap a missed mock or exam leaves behind, on any of the four exam boards, to rebuild a subject's momentum before the deadlines above close.
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