Every Harrow provider's 2024/25 DfE value-added score for A-level Mathematics, and why the partnership row repeats ten of them.
Book a Free ConsultationHarrow is a London borough that is also its own local authority (code 310) for DfE's school-level data, so every provider here sits inside the borough. Its 2024/25 value-added dataset for A-level Mathematics covers seventeen providers, sixteen published. Four clear DfE's bar for a genuine finding — a 95% confidence interval entirely on one side of zero — including a 425-entry row that belongs to a partnership, the Harrow Sixth Form Collegiate, and repeats ten rows below it.
No school two streets over in Barnet, Brent or Hillingdon is folded into any of the figures below — Harrow's own local-authority boundary is the whole of the coverage.
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Book a Free Consultation Message us on WhatsAppThis page covers A-level Mathematics specifically — subject code 5R0jd in DfE's own dataset. It never folds in Mathematics (Further), code 43RYU, or Mathematics (Statistics), code 0hPCT: both are separate subjects with their own rows, scored on their own scale, and neither is comparable to a Mathematics score even at the same school.
Value added compares the grade each student actually achieved in A-level Mathematics against the grade their own prior attainment predicted for them, not against a fixed national pass mark or a borough average. A provider whose students arrive with modest GCSE results and go on to strong A-level grades scores well on this measure even if its raw grades never top a league table; a provider whose students arrive with excellent GCSEs and leave with merely adequate A-levels can score poorly on it even while its raw grades look impressive. That is the whole reason the measure exists, and it is also why a value-added score is never a substitute for asking what a school's students actually achieved.
The score is calculated separately for every subject, and Mathematics is scored on its own scale, unrelated to a school's figure in any other subject. The Department for Education's own subject list carries Mathematics as code 5R0jd, Mathematics (Further) as 43RYU and Mathematics (Statistics) as 0hPCT, and a provider's row in one tells you nothing about its row in either of the other two — a school strong in Mathematics can be unremarkable in Further Mathematics the same year, or the reverse.
Not every score is a finding. DfE publishes a 95% confidence interval alongside every value-added figure, and a score counts as a genuine result only when that interval sits entirely on one side of zero — if the interval still spans zero, the honest reading is that the data cannot rule out an average result, whatever the headline number says. Of Harrow's seventeen A-level Maths rows for 2024/25, sixteen are published. The seventeenth, Stanmore College, is not: every field of its row — the score, both confidence bounds and the matched-entry count — reads "c", DfE's marker for a cohort it judges too small to publish without risking identifying individual students. Stanmore College is the only Harrow row suppressed for this subject this year.
The table below lists every single-institution row in Harrow's 2024/25 A-level Mathematics value-added dataset — sixteen providers, sorted by matched entries, the size of the cohort each score is built on, never by the score itself. The Harrow Sixth Form Collegiate is not in this table, because it is not a single institution; its own figure is covered separately below.
| Provider | Matched entries | Value added (95% CI) | Clears zero? |
|---|---|---|---|
| St Dominic's Sixth Form College | 362 | -0.06 (-0.19 to 0.07) | No |
| Nower Hill High School | 111 | +0.11 (-0.11 to 0.34) | No |
| Harrow School | 97 | 0.00 (-0.24 to 0.25) | No |
| Avanti House School | 85 | +0.69 (0.43 to 0.96) | Yes |
| Whitmore High School | 85 | +0.20 (-0.06 to 0.46) | No |
| Pinner High School | 78 | +0.27 (0.00 to 0.55) | No |
| Park High School | 64 | 0.00 (-0.30 to 0.30) | No |
| North London Collegiate School | 50 | +0.20 (-0.14 to 0.54) | No |
| The John Lyon School | 27 | +0.21 (-0.26 to 0.67) | No |
| Bentley Wood High School | 20 | +0.52 (-0.02 to 1.06) | No |
| Harrow High School | 17 | +0.71 (0.13 to 1.30) | Yes |
| Rooks Heath School | 14 | -0.55 (-1.20 to 0.09) | No |
| Hatch End High School | 13 | +0.21 (-0.46 to 0.88) | No |
| Canons High School | 12 | -0.73 (-1.42 to -0.03) | Yes |
| Whitefriars School | 11 | +0.68 (-0.04 to 1.41) | No |
| Stanmore College | Suppressed ("c") | Suppressed ("c") | Suppressed |
Sorted by matched entries, never by score. Source: Department for Education institution-level subject value added dataset, A-level Mathematics, local authority 310, 2024/25, queried directly against the API and cross-checked against each provider's GIAS record. Every score is DfE's progress measure for 2024/25 entrants only and is not a measure of teaching quality.
Three of these sixteen single-institution rows clear zero. Avanti House School's value-added score for A-level Mathematics is +0.69, with a 95% confidence interval of 0.43 to 0.96 from 85 matched entries — DfE's progress measure for 2024/25 entrants, not a measure of teaching quality.
Harrow High School's value-added score is +0.71, with a 95% confidence interval of 0.13 to 1.30 from 17 matched entries — DfE's progress measure for 2024/25 entrants, not a measure of teaching quality. The interval spans 1.17 points end to end (1.30 minus 0.13), on a cohort of seventeen students.
Canons High School's value-added score is -0.73, with a 95% confidence interval of -1.42 to -0.03 from 12 matched entries — DfE's progress measure for 2024/25 entrants, not a measure of teaching quality. The interval's upper bound sits at -0.03, three-hundredths of a point below zero, on a cohort of twelve.
One near miss is worth reading carefully, because it shows the rule at work rather than a number that merely looks positive. Pinner High School's own interval, 0.00 to 0.55 from 78 matched entries, does not clear zero: the lower bound sits exactly at zero rather than above it, so DfE's own rule keeps this row out of the three above, even though its score is positive and its cohort is far larger than either Harrow High School's or Canons High School's.
Wondering what any of this means for your own child's target grade? Our expert A-level maths tutors help Harrow students turn a specific starting point into a plan — whichever of the providers above their sixth form is, and whatever grade they are working from now.
Book a Free Consultation Message us on WhatsAppThe largest matched-entry count in Harrow's entire A-level Maths dataset, 425, belongs to a row labelled simply "Harrow Collegiate" — and it is not a school. It is an aggregate of ten separate sixth forms, not the result of any single institution, so it cannot be read alongside a single school's own row, not St Dominic's, not Nower Hill, not any other row on this page, as though the four were peers.
Harrow Council's own admissions page names the partnership directly, as the Harrow Sixth Form Collegiate, and lists its fourteen members: Bentley Wood sixth form, Canons sixth form, Harrow High sixth form, Harrow College sixth form centre, Hatch End sixth form, Kingsley High school, Nower Hill sixth form, Park High sixth form, Pinner High school sixth form, Rooks Heath sixth form, Shaftesbury High sixth form, Stanmore sixth form college, Whitefriars school sixth form and Whitmore sixth form. The same council page is explicit about who is outside it: "the following schools and colleges in Harrow have sixth form places, but they are not a part of the Harrow Collegiate" — naming St Dominic's Sixth Form College as the example.
In the Department for Education's own value-added dataset, that partnership is registered as its own institution, URN 135469, confirmed open on the Get Information about Schools service under the establishment type "Sixth form centres." That same register links it to ten of the council's fourteen members, and those ten are the schools its figure is built from. Its A-level Mathematics value-added score is +0.16, with a 95% confidence interval of 0.04 to 0.28 from 425 matched entries — a genuine finding by DfE's own rule, and, again, DfE's progress measure for 2024/25 entrants, not a measure of teaching quality. Because that figure aggregates ten sixth forms' students into one score, it says something about the partnership's shared A-level Maths provision as a whole; it says nothing about any one of those ten schools individually.
All ten of the linked schools — Nower Hill, Whitmore, Pinner High, Park High, Bentley Wood, Harrow High, Rooks Heath, Hatch End, Canons High and Whitefriars — also carry their own separate A-level Maths value-added row in this same dataset, listed in the table above. Their entries are not divided between the two registrations. Those ten rows hold 111, 85, 78, 64, 20, 17, 14, 13, 12 and 11 matched entries, which add to 425 — the Collegiate's figure exactly. The partnership row is the same students counted a second time, so reading it alongside the rows above would count 425 of Harrow's A-level Maths entries twice.
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Harrow's roster for this dataset is not the same list of providers that appears on the borough's GCSE results. Two schools named on our GCSE tuition in Harrow page's own Attainment 8 table — Sacred Heart Language College and Salvatorian Roman Catholic College — carry no row at all in this A-level Maths value-added dataset; a full sweep of Harrow's 2024/25 data for every subject and qualification returns no entry for either school once filtered to A-level Mathematics. Three post-16-only institutions appear here with no GCSE-table counterpart at all: the Harrow Sixth Form Collegiate, St Dominic's Sixth Form College and Stanmore College, none of which has a Key Stage 4 cohort to publish.
One contrast runs the other way, and it is worth stating plainly because our GCSE page explains a gap this page does not have. Harrow School, North London Collegiate School and The John Lyon School each carry their own A-level Maths value-added row in this dataset, full stop — unlike their GCSE Attainment 8 entries, which our GCSE tuition in Harrow page explains are artificially low because none of the three enters the reformed 9-1 GCSE in English, Maths or the sciences. A-level itself carries no such exclusion: it sits on DfE's approved qualification list regardless of which GCSE or IGCSE a student's school used to get there, so no equivalent gap opens up here.
What this data is useful for is not chasing a borough ranking; it is knowing what a specific sixth form's cohort looks like before a first session begins. Our expert A-level maths tutors help students at every Harrow sixth form named on this page — from St Dominic's, the largest single-school cohort, to the smallest rows, at Canons High and Whitefriars — building a programme around a student's own specification and the papers they are actually sitting, not a generic scheme of work. Our A-level maths tuition page covers how the three live exam boards' specifications compare in full; we do not repeat that comparison here.
A tutor's first job with a new Harrow A-level Maths student is confirming which board's specification their sixth form actually enters — AQA, Edexcel or OCR each publish their own A-level Mathematics specification, and our dedicated AQA, Edexcel and OCR A-level Maths pages cover each board's own paper structure and content in detail. Whichever board a student's sixth form has entered them for, sessions run from that board's own past papers and mark schemes rather than a generic Pure and Applied syllabus.
Working out which Harrow sixth form's data actually applies to your child? Our expert A-level maths tutors build every programme around a student's own school, exam board and current working grade — not a borough-wide average. Leading Tuition is rated 4.8 out of 5 on Trustpilot from 59 reviews, read on 3 October 2026.
Book a Free Consultation Message us on WhatsAppSessions run one-to-one, online or in person, with a shared whiteboard that lets a tutor work through past-paper questions, mark answers against the real mark scheme for a student's own board, and share annotated resources in real time. A baseline assessment comes first, so a programme starts from where a student's Pure, Statistics and Mechanics content genuinely sits rather than from an assumption based on their sixth form's borough-wide figures. Families weighing GCSE Maths support for a younger child can also see our GCSE tuition in Harrow page, and our overview of tutoring across Harrow covers every level and subject we teach in the borough.
All figures above are drawn directly from the Department for Education's institution-level subject value added dataset (A-level Mathematics, local authority 310, 2024/25), queried against the Explore Education Statistics API, cross-checked against the Get Information about Schools service, and the Harrow Sixth Form Collegiate's fourteen-member list is sourced directly from Harrow Council's own sixth form admissions page, while the ten schools DfE links to the partnership are taken from the Get Information about Schools record for URN 135469. Figures checked on 27 September 2026; the partnership links checked on 29 September 2026.
It measures how far each provider's A-level Mathematics students' grades sat above or below the grades their own prior attainment predicted, not against a fixed national standard, so it separates teaching from intake in a way a raw average grade cannot. It is calculated separately for every subject — Mathematics is subject code 5R0jd in the Department for Education's own dataset, entirely distinct from Mathematics (Further), code 43RYU, and Mathematics (Statistics), code 0hPCT — so a school's A-level Maths score says nothing about how the same school does in either of those two subjects. A score only counts as a genuine finding when its 95% confidence interval sits entirely on one side of zero.
Three single-institution providers: Avanti House School at +0.69, a 95% confidence interval of 0.43 to 0.96 from 85 matched entries; Harrow High School at +0.71, interval 0.13 to 1.30 from 17 matched entries; and Canons High School at -0.73, interval -1.42 to -0.03 from 12 matched entries. All three are DfE's progress measure for 2024/25 entrants, not a measure of teaching quality. A fourth row, the Harrow Sixth Form Collegiate, also clears zero, but it aggregates ten partner sixth forms rather than describing one school, so it is treated separately rather than ranked alongside these three.
A partnership of fourteen Harrow school and college sixth forms, named directly on Harrow Council's own admissions page: Bentley Wood, Canons, Harrow High, Harrow College sixth form centre, Hatch End, Kingsley High, Nower Hill, Park High, Pinner High, Rooks Heath, Shaftesbury High, Stanmore sixth form college, Whitefriars and Whitmore. St Dominic's Sixth Form College is named explicitly as not part of the partnership. In the Department for Education's own value-added dataset, the Collegiate is registered as its own institution (URN 135469) and its 425 matched A-level Maths entries — the largest number in any Harrow row for this subject — is an aggregate of the ten schools DfE's register links to it, and those same entries are counted again in those ten schools' own rows.
The Department for Education records every field of Stanmore College's row — the score, both confidence-interval bounds and the matched-entry count — as "c", its standard marker for a cohort suppressed to protect the identity of a small number of students. That leaves sixteen of Harrow's seventeen A-level Maths rows published for 2024/25 rather than all seventeen, and it is the only Harrow row suppressed for this subject in this year's data.
Yes, for all three: Harrow School, North London Collegiate School and The John Lyon School each carry their own A-level Mathematics value-added row in this dataset. That is a genuine contrast with Harrow's GCSE Attainment 8 table, where our separate GCSE tuition in Harrow page explains why the same three schools show artificially low scores — A-level sits on DfE's approved qualification list regardless of a school's GCSE or IGCSE choice, so no equivalent exclusion applies here.
Harrow is local authority code 310 in its own right, so every row on this page is drawn from that single local-authority sweep in the Department for Education's dataset — no school from Barnet, Brent or Hillingdon is folded in, and none of Harrow's own seventeen rows needs reaching for across a boundary. That is different from three other cities in the same research batch, where the local authority covers a much wider area than the town itself.
Wide. Harrow High School's interval, built from 17 matched entries, runs from 0.13 to 1.30 — a span of 1.17 points end to end, even though the whole interval clears zero. Canons High School's interval, from 12 matched entries, runs from -1.42 to -0.03, and its upper bound sits only 0.03 below zero. Both are genuine findings by DfE's own rule, but the width is part of what a cohort that size means, and a single year's cohort moving by a handful of students would be enough to shift either result.
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