ACS Hillingdon International School vs St John's Preparatory and Senior School
A head-to-head comparison of two all-through schools in London, England, 26 km apart, using official English 2025 data. The better value in each row is highlighted.
ACS Hillingdon International School
Uxbridge · Independent all-through · Ages 3–19
494 students
St John's Preparatory and Senior School
Potters Bar · Independent all-through · Ages 3–19
493 students
| Measure | ACS Hillingdon International School Uxbridge, London | St John's Preparatory and Senior School Potters Bar, London |
|---|---|---|
| Success Index (England) | – Not rated | 94 Top 5% |
| Region rank | – | #30 of 640 |
| National rank | – | #142 of 4,090 |
| Sector | Independent | Independent |
| Type | All-through | All-through |
| Year range | Ages 3–19 | Ages 3–19 |
| Students | 494 | 493 |
| Pupils on roll | 494 | 493 |
| Free school meals | – | – |
| Capacity filled | 73.2% | 88.4% |
| KS2 expected standard (RWM) | – | – |
| KS2 higher standard (RWM) | – | – |
| KS2 reading progress | – | – |
| KS2 writing progress | – | – |
| KS2 maths progress | – | – |
| Attainment 8 | – | 68.1 |
| Progress 8 | – | – |
| Grade 5+ English & maths | – | 97.5% |
| Grade 4+ English & maths | – | 100% |
| EBacc average points | – | 5.95 |
| A level points per entry | – | 39.5 |
| town | Uxbridge | Potters Bar |
| region | London | London |
| Website | www.acs-schools.com/hillingdon | www.stjohnsprepandseniorschool.co.uk |
The verdict
- •ACS Hillingdon International School is the larger school with 494 students compared with 493.
The Success Index (England) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is ACS Hillingdon International School better than St John's Preparatory and Senior School?
The two schools are very close on the Success Index (England). Differences in sector, size, programmes and distance from home will matter more than the score.
How far apart are ACS Hillingdon International School and St John's Preparatory and Senior School?
About 26 km in a straight line, between Uxbridge and Potters Bar in London.
Which has the better Pupils on roll?
ACS Hillingdon International School: 494. St John's Preparatory and Senior School: 493. Number of pupils in the latest school census.
How do ACS Hillingdon International School and St John's Preparatory and Senior School rank in London?
ACS Hillingdon International School is unranked and St John's Preparatory and Senior School is 30th of 640 among all-through schools in London on the 2025 Success Index (England).