Exam results are one of the first things parents reach for when comparing schools — and one of the easiest to misread. A headline figure can flatter a school that simply admits high-achieving children, or undersell one doing remarkable work with a broad intake. Reading results well means understanding what each measure actually shows, and what it quietly hides.
This guide explains the main measures — GCSE, A-level and Progress 8 — what they really tell you, the traps to avoid, and how to compare schools fairly.
Why headline figures mislead
The single biggest mistake is treating a top-line percentage as a verdict on school quality. It rarely is, for one overriding reason: selective intake inflates results.
A grammar school or academically selective independent school starts with high-attaining pupils. Strong results are therefore partly a reflection of who walked through the door, not how much the school added. Meanwhile, a school with a broad, all-ability intake might be doing extraordinary work yet post lower headline grades simply because of where its pupils started.
So before reading any result, ask: what kind of children does this school admit? The same number means very different things at a selective and a non-selective school.
GCSE measures
GCSEs are taken at the end of Year 11 (around age 16) and graded 9 to 1 in England, with 9 the highest. You'll encounter several common metrics:
- Grade 5 and above in English and maths. A grade 5 is often described as a "strong pass." The percentage achieving this in both subjects is a widely quoted benchmark.
- Grade 4 and above. A grade 4 is a "standard pass"; this measure sets a lower bar.
- Attainment 8. A school's average score across eight key qualifications per pupil, giving a fuller picture than a single threshold.
- The English Baccalaureate (EBacc). Not a qualification but a measure of how many pupils take and pass a core group of academic subjects (English, maths, sciences, a language, and history or geography).
Reading GCSE results well
- Look at the spread, not just the headline. A high average can hide a wide gap between top and bottom; a school where almost everyone does solidly may serve a broad intake better.
- Check English and maths together — these underpin most futures.
- Consider Attainment 8 for a rounded view rather than a single threshold.
- Always read against the intake. Strong grades from a non-selective school may signal more impressive teaching than higher grades from a selective one.
Progress 8: the measure that levels the field
Progress 8 is the measure designed precisely to address the intake problem — and it's arguably the most useful single number for comparing state secondary schools.
Rather than measuring raw attainment, Progress 8 estimates how much progress pupils make between the end of primary school and their GCSEs, compared with pupils who started at similar levels nationally. It captures the value the school adds, not just the ability of who it admits.
How to read it:
- A score around zero means pupils made roughly the progress expected given their starting points.
- A positive score means they made more progress than similar pupils elsewhere — a good sign of effective teaching.
- A negative score means less progress than expected.
A non-selective school with a strongly positive Progress 8 may be adding far more than a selective school with glittering raw results but flat progress. For comparing state schools fairly, Progress 8 often tells you more than the headline pass rate.
A few caveats: Progress 8 can be volatile in small cohorts, and it isn't published in the same way for independent schools, which sit outside the measure. Use it as a powerful tool where available, alongside the other evidence.
A-level and sixth-form measures
At 18, results shift to A-levels (and equivalents). Common measures include:
- Average grade or points per entry, summarising overall performance.
- Percentage at A–A or A–B**, often used to gauge top-end strength — relevant if your child is aiming at competitive universities.
- Value-added measures for 16–18, which, like Progress 8, estimate progress made during the sixth form rather than raw attainment.
Reading A-level results well
- Match the measure to your child's goals. Top-grade percentages matter most for the most competitive courses; a broad average matters for the wider cohort.
- Look at value-added where available to see how much the sixth form develops its students.
- Consider subject breadth — does the school offer and support the subjects your child wants, and get good results across them, not just in a few?
- Look at destinations: where do leavers actually go, and does that align with your hopes?
What the numbers don't show
Results are only part of a school's story. They say nothing about:
- Pastoral care and wellbeing — how happy, supported and safe children are.
- Breadth — sport, music, art, drama and character development.
- Teaching culture — whether learning is inspiring or merely effective at passing exams.
- Fit — whether your child would thrive in this particular environment.
A school can have excellent results and be wrong for your child; another with quieter numbers might be exactly right. Treat results as one important input, not the whole decision.
How to compare schools fairly
Putting it together, a sound approach:
- Identify the intake. Selective or all-ability? This frames every figure that follows.
- Prioritise progress over raw attainment where you can — Progress 8 for state secondaries, value-added for sixth forms.
- Look at the spread, not just averages, to see how the school serves the full range of pupils.
- Match measures to your child — top grades for the most competitive paths, solid all-round results for most.
- Check destinations as a real-world outcome.
- Combine results with everything else — visits, pastoral care, ethos and fit.
You can line schools up on results and other measures using our comparison tool, and browse GCSE and A-level tables as a starting point — read, as always, in the context of intake.
The bottom line
Reading exam results well is less about finding the highest number and more about understanding what each number means. Selective intakes inflate headline grades; progress measures like Progress 8 reveal the value a school actually adds; spread and destinations fill in the picture; and none of it captures the pastoral and human factors that matter just as much. Read results in context, weigh progress over raw attainment, and always finish by asking whether the specific school suits your specific child.
Next steps: Compare schools on results and progress, or explore the GCSE and A-level league tables to begin.