Test a claim

Does the lead hold up?

A school can look ahead over one period and behind over another. Choose two schools and a result to see whether the lead holds when the years change.

“Typical” means the median yearly gap: the middle value when the gaps are put in order, or the average of the two middle values. This question concerns one published result. It cannot establish which school is better overall. Where qualifications differ, our calculation explains which grades count together; how they work.

Example: St Paul’s v Westminster. Turn JavaScript on to test your own.

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The claim

“St Paul’s is higher than Westminster on A-level grades at A*.”

A-level grades at A* · 2010–2025

No consistent lead

Neither school has a consistent lead on the share of A-level entries awarded A*. St Paul’s comes out slightly higher when all the available years are compared, but Westminster comes out higher over some shorter periods.

Based on 11 years with comparable figures (2010–2019, 2025).

How we worked this out
11shared years
45year ranges tested
5years left out (2020–2024)

Over the 11 years we can compare (2010–2019, 2025), St Paul’s is ahead by a typical (median) gap of 0.7 points, under one point. Change the years and the lead flips: of the 45 year ranges we tested (each at least 3 shared years), Westminster comes out ahead in 24 and St Paul’s in 21. Each year has equal weight. We do not pool all the pupils or exam entries into one rate.

The typical gap, and the latest shared year (2025)

How we reach the conclusion

With fewer than 3 shared years we give the figures and no verdict. If at least 25% of the year ranges we test point the other way, it depends on the years. A typical gap under 1 point is too close to call. A gap of 1 to 3 points that at least 75% of ranges agree on holds up, narrowly; 3 points or more with at least 90% agreeing holds up, and with 75% to 90% agreeing it holds up, mostly. Anything else is mixed. On Test a claim, a typical gap that favours the other school points the other way. Where comparable figures are known only as a range and the verdict differs between the two ends, it depends on the schools’ rounding. The comparison rules in full.

Share of published A-level entries awarded A* in the named examination year.

Compare different periods

What changes the answer?

Which school leads depends on the years you pick

St Paul’s leads in 21 year ranges, Westminster in 24, none tied. Many of these periods include the same years. The counts show how the answer changes with the dates; they are not probabilities.

Drop 2019 and 2025 and the lead disappears: over 2010–2018 (9 shared years), the typical gap is −0.1 pp, effectively level.

Largest lead for St Paul’s

St Paul’s ahead

6.5 pp

2010–2012 · 3 shared years

Largest lead for Westminster

Westminster ahead

−3.9 pp

2014–2016 · 3 shared years

These periods give each school its largest lead. They show why the choice of years matters; either one, quoted alone, would leave out part of the story.

Every year range, at a glance

Read a first year across to a last year. Select a cell to see its figures. Each marked cell is a run of at least 3 shared years measured the same way.

+ St Paul’s ahead− Westminster ahead0 level· not a year range
Rows: first shared year. Columns: last shared year. Signs use the published figures.
First / last20102011201220132014201520162017201820192025
2010··
2011···
2012····
2013·····
2014······
2015·······
2016········
2017·········
2018··········
2019···········
2025···········

A range may skip years with no comparable pair. Ranges with the same years count once. No range mixes figures measured in different ways.

One year range

2010–2018 · 9 shared years

St Paul’s minus Westminster: −0.1 percentage points, the typical (median) yearly gap.

Shared years: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018. Years in this span without a comparable pair: none.

Figures at their published precision; a small gap may not reflect a difference in the unrounded results.

The figures behind this, as each school printed them
School and yearFigureWhat it countsSource
St Paul’s School
2010
53.5%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2010
Westminster School
2010
47%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 565Source and full figures: Westminster School, 2010
St Paul’s School
2011
52.3%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2011
Westminster School
2011
53%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 552Source and full figures: Westminster School, 2011
St Paul’s School
2012
55.6%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2012
Westminster School
2012
49%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 536Source and full figures: Westminster School, 2012
St Paul’s School
2013
44.9%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2013
Westminster School
2013
45%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 532Source and full figures: Westminster School, 2013
St Paul’s School
2014
47.7%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2014
Westminster School
2014
47%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 573Source and full figures: Westminster School, 2014
St Paul’s School
2015
42.1%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2015
Westminster School
2015
49%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 583Source and full figures: Westminster School, 2015
St Paul’s School
2016
45.1%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2016
Westminster School
2016
49%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 570Source and full figures: Westminster School, 2016
St Paul’s School
2017
46.9%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2017
Westminster School
2017
47%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 469Source and full figures: Westminster School, 2017
St Paul’s School
2018
51%A-level post-2010 A*–E · Grade awardsA-level subject entriesSource and full figures: St Paul’s School, 2018
Westminster School
2018
48%A-level post-2010 A*–E · Grade awardsA-level subject entriesOut of 460Source and full figures: Westminster School, 2018
Record details

Each figure’s status as recorded, the precision it was printed to, and its record code.

  • St Paul’s School, 2010: Published figure · 1 decimal place · fig:st_pauls_alevel:16
  • Westminster School, 2010: Primary · 0 decimal places · fig:westminster_alevel:22
  • St Paul’s School, 2011: Published figure · 1 decimal place · fig:st_pauls_alevel:17
  • Westminster School, 2011: Primary · 0 decimal places · fig:westminster_alevel:23
  • St Paul’s School, 2012: Primary / Secondary · 1 decimal place · fig:st_pauls_alevel:18
  • Westminster School, 2012: Primary · 0 decimal places · fig:westminster_alevel:24
  • St Paul’s School, 2013: Primary / Secondary · 1 decimal place · fig:st_pauls_alevel:19
  • Westminster School, 2013: Primary · 0 decimal places · fig:westminster_alevel:25
  • St Paul’s School, 2014: Primary / Secondary · 1 decimal place · fig:st_pauls_alevel:20
  • Westminster School, 2014: Primary · 0 decimal places · fig:westminster_alevel:26
  • St Paul’s School, 2015: Primary / Secondary · 1 decimal place · fig:st_pauls_alevel:21
  • Westminster School, 2015: Primary · 0 decimal places · fig:westminster_alevel:27
  • St Paul’s School, 2016: Published figure · 1 decimal place · fig:st_pauls_alevel:22
  • Westminster School, 2016: Primary · 0 decimal places · fig:westminster_alevel:28
  • St Paul’s School, 2017: Published figure · 1 decimal place · fig:st_pauls_alevel:23
  • Westminster School, 2017: Primary · 0 decimal places · fig:westminster_alevel:29
  • St Paul’s School, 2018: Published figure · 0 decimal places · fig:st_pauls_alevel:24
  • Westminster School, 2018: Primary · 0 decimal places · fig:westminster_alevel:30

Quote it like this

This wording keeps the years and the limits with the finding.

St Paul’s v Westminster, A-level grades at A* (Share of published A-level entries awarded A* in the named examination year), 2010–2025.
Depends on the years: over the 11 years with comparable figures for both (2010–2019, 2025), the typical (median) yearly gap, St Paul’s minus Westminster, is 0.7 percentage points. 21 of 45 overlapping year ranges of 3 or more years agree with that direction and 24 point the other way.
For example, over 2010–2018 (9 shared years: 2010–2018) the typical gap is −0.1 percentage points, so the lead disappears.
The ranges share years, so these counts aren’t odds or independent samples. Published figures, at their published precision; underlying unrounded results may differ. Years without a comparable pair: 2020–2024. Not a measure of teaching, and not a prediction for one child.
Method: period-check-v1, constant-definition-v1 (45 year ranges tested). Evidence version: 15e7e2e5e6e94ce6d07d3cbdfef862ad997d59895bff654d38cf8592a07ca995.

Years left out: 2020–2024

A missing year counts for neither school.

Why each year was left out, and the definitions
Every year or figure left out of this check, with the record behind it
Year · schoolWhy it was left outRecord
2010 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2010:a-level:total:cb3cab7e
Record ↗ research:st-pauls:2010:six-school-audit:a-level:derived-published-total
2011 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2011:a-level:total:d4ebf945
Record ↗ research:st-pauls:2011:six-school-audit:a-level:derived-published-total
2012 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ research:st-pauls:2012:a-level:total:e174a93e
Record ↗ research:st-pauls:2012:six-school-audit:a-level:derived-published-total
2013 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ research:st-pauls:2013:a-level:total:e8a1d85f
Record ↗ research:st-pauls:2013:six-school-audit:a-level:derived-published-total
2016 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2016:a-level:total:ff5ea676
Record ↗ research:st-pauls:2016:six-school-audit:a-level:derived-published-total
2020 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; 2020–21, when exams were cancelled and schools assessed grades; No figureRecord ↗ research:st-pauls:2020:filed-report:a-level---pre-u-combined
2021 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; 2020–21, when exams were cancelled and schools assessed grades; No figureRecord ↗ research:st-pauls:2021:filed-report:a-level---pre-u-combined
Record ↗ research:st-pauls:2021:six-school-audit:a-level:derived-annual-information-a-level
2022 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2022:dfe-ks5-institution-aggregated-results-6187
Record ↗ research:st-pauls:2022:a-level:2025-summary-version
Record ↗ research:st-pauls:2022:six-school-audit:dfe-completion-cohort:a-level
2023 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2023:dfe-ks5-institution-aggregated-results-6376
Record ↗ research:st-pauls:2023:a-level:2025-summary-version
Record ↗ research:st-pauls:2023:six-school-audit:a-level:derived-annual-information-a-level
Record ↗ research:st-pauls:2023:six-school-audit:dfe-completion-cohort:a-level
2024 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figure; Another publication supplies this year’s comparison figureRecord ↗ research:st-pauls:2024:dfe-ks5-institution-aggregated-results-5755
Record ↗ research:st-pauls:2024:a-level:2025-summary-version
Record ↗ research:st-pauls:2024:six-school-audit:dfe-completion-cohort:a-level
2025 · St Paul’sCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ research:st-pauls:2025:dfe-ks5-institution-aggregated-results-5471
Record ↗ research:st-pauls:2025:six-school-audit:dfe-completion-cohort:a-level
2010 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2010:dfe-2010-accountability-c30
Record ↗ new:westminster:2010:dfe-2010-accountability-c31
Record ↗ new:westminster:2010:dfe-2010-accountability-c32
Record ↗ new:westminster:2010:dfe-2011-accountability-c37
Record ↗ new:westminster:2010:dfe-2011-accountability-c40
Record ↗ new:westminster:2010:dfe-2012-accountability-c50
Record ↗ new:westminster:2010:dfe-2012-accountability-c53
2011 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2011:dfe-2011-accountability-c29
Record ↗ new:westminster:2011:dfe-2011-accountability-c30
Record ↗ new:westminster:2011:dfe-2011-accountability-c31
Record ↗ new:westminster:2011:dfe-2011-accountability-c32
Record ↗ new:westminster:2011:dfe-2011-accountability-c33
Record ↗ new:westminster:2011:dfe-2011-accountability-c34
Record ↗ new:westminster:2011:dfe-2012-accountability-c51
Record ↗ new:westminster:2011:dfe-2012-accountability-c54
Record ↗ new:westminster:2011:isc:a-level-isc-population
Record ↗ research:westminster:2011:existing-counts-new-westminster-2011-isc-a-level-isc-population
2012 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2012:dfe-2012-accountability-c29
Record ↗ new:westminster:2012:dfe-2012-accountability-c30
Record ↗ new:westminster:2012:dfe-2012-accountability-c31
Record ↗ new:westminster:2012:dfe-2012-accountability-c32
Record ↗ new:westminster:2012:dfe-2012-accountability-c33
Record ↗ new:westminster:2012:dfe-2012-accountability-c34
Record ↗ new:westminster:2012:dfe-2012-accountability-c35
Record ↗ new:westminster:2012:dfe-2012-accountability-c36
Record ↗ new:westminster:2012:dfe-2012-accountability-c37
Record ↗ new:westminster:2012:dfe-2012-accountability-c38
Record ↗ new:westminster:2012:dfe-2012-accountability-c39
Record ↗ new:westminster:2012:dfe-2012-accountability-c40
Record ↗ new:westminster:2012:dfe-2012-accountability-c41
Record ↗ new:westminster:2012:dfe-2012-accountability-c42
Record ↗ new:westminster:2012:dfe-2012-accountability-c43
Record ↗ new:westminster:2012:dfe-2012-accountability-c44
Record ↗ new:westminster:2012:dfe-2012-accountability-c45
Record ↗ new:westminster:2012:dfe-2012-accountability-c46
Record ↗ new:westminster:2012:dfe-2012-accountability-c47
Record ↗ new:westminster:2012:dfe-2012-accountability-c48
Record ↗ new:westminster:2012:dfe-2012-accountability-c55
Record ↗ new:westminster:2012:dfe-2012-accountability-c56
2015 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2015:isc:a-level-isc-population
Record ↗ research:westminster:2015:existing-counts-new-westminster-2015-isc-a-level-isc-population
2016 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2016:isc:a-level-isc-population
Record ↗ research:westminster:2016:existing-counts-new-westminster-2016-isc-a-level-isc-population
2017 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2017:isc:a-level-isc-population
Record ↗ research:westminster:2017:existing-counts-new-westminster-2017-isc-a-level-isc-population
2018 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ research:westminster:2018:a-level-2018-school-subject-counts
Record ↗ research:westminster:2018:isc-shared-a-level-isc-population
2019 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2019:sixth-form-published-equivalent:newsletter
Record ↗ research:westminster:2019:a-level-2019-school-subject-counts
Record ↗ research:westminster:2019:isc-shared-a-level-isc-population
2020 · WestminsterNo figure found for this yearNo record for this year
2021 · WestminsterNo figure found for this yearNo record for this year
2022 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2022:dfe-ks5-institution-aggregated-results-2911
Record ↗ research:westminster:2022:a-level-school-subject-counts
Record ↗ research:westminster:2022:isc-shared-a-level-isc-population
2023 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2023:dfe-ks5-institution-aggregated-results-3134
Record ↗ research:westminster:2023:a-level-school-subject-counts
Record ↗ research:westminster:2023:isc-shared-a-level-isc-population
2024 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2024:dfe-ks5-institution-aggregated-results-2662
Record ↗ research:westminster:2024:a-level-school-headline-march-2025
Record ↗ research:westminster:2024:a-level-school-subject-counts
Record ↗ research:westminster:2024:isc-shared-a-level-isc-population
2025 · WestminsterCovers a different group from the school-wide series; Measured differently; Unclear which group it counts; No figureRecord ↗ new:westminster:2025:dfe-ks5-institution-aggregated-results-2586
Record ↗ research:westminster:2025:existing-counts-fig-westminster_alevel-32

These figures cover A levels alone. IB, Pre-U and combined-qualification results are kept separately. Teacher-assessed results from 2020–21 are left out unless you choose to include them. Where publications disagree and the difference remains unresolved, both figures stay in the source record and neither enters this comparison.

How comparisons work

What to ask next

Ask the schools for the missing years, measured exactly this way.

Results can’t separate a school’s teaching from its intake, or predict one pupil’s admission. The complete research sample shows what a study adds to this free check.

Exactly what this test does

We try each possible start and end year within your selection, using only years with comparable figures for both schools. For each period, we put the yearly gaps in order and take the middle value, averaging the middle pair when there is an even number. That is the median. A period needs your chosen minimum of three or five shared years, counting the same qualification, group and outcome. It may skip years with missing figures. Two periods that contain exactly the same years count once.

The minimum keeps a very short run from standing in for a longer history; it is not a guarantee of statistical significance. We leave out missing values, teacher-assessed years (2020–21), conflicting published figures and results measured differently. University outcomes retain their separate definitions. Small gaps may turn on rounding, so the answer concerns the published figures. Where a figure is known only as a range, we test both ends.

A shared link opens your question with the latest figures and tells you if they have changed. The download keeps the figures and settings used in this check. A saved check stays in this browser; it does not create an account or send alerts.

Method: period-check-v1, on the same rule as the comparison page (constant-definition-v1): a median is never taken across a change of qualification, population or outcome definition. This describes the available results. It does not measure a school’s effect on pupils, test statistical significance or forecast future grades. How comparisons work.

Figure and sourceOpen full record ↗