Sir Joseph Williamson's Mathematical School
Rochester, Kent, South East · ME1 3EL
A selective boys' grammar in Rochester, Sir Joseph Williamson's Mathematical School has built a reputation for sustained academic strength, holding an Outstanding rating from Ofsted across every category at its most recent inspection, including its sixth form. With around 1,528 pupils on roll against a capacity of 1,280, it operates well above its intended size, a reflection of how sought-after places here have become. Entry at 11 admits 203 pupils, and the school draws a varied community, with roughly one in seven pupils speaking English as an additional language.
1,528
Pupils
Outstanding
Ofsted
203
Places (PAN)
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Schools nearby
Open in Google Maps ↗Overview & data
- Gender
- Boys
- Type
- state grammar school
- Pupils
- 1,528
- Pupil:teacher ratio
- 21.1
- Location
- Rochester, Kent, South East
- Website
- http://www.sjwms.org.uk
Entrance & admissions
- Consortium
- Medway Test
- Exam board
- GL Assessment
- Subjects tested
- English, Maths, Non-Verbal Reasoning, Verbal Reasoning
- Places (PAN)
- 203
- Entry age
- 11
Key dates· 2027 entry
Application deadlineNext
31 October 2026
Offers date
1 March 2027
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Latest results
Attainment 8
69.5
National average 46.9
GCSE grade 5+ (English & Maths)
94%
National average 47%
Teaching & academics
Results sit far ahead of national benchmarks. The average Attainment 8 score of 69.5 dwarfs the national figure of 46.9, and 94% of pupils secure grade 5 or above in English and Maths, against a national average of 47%. Ofsted judged the quality of education Outstanding, and the picture is consistent through to a sixth form rated equally highly. A pupil-to-teacher ratio of about 21.1 is fairly typical for a large state school.
Learning support & SEN
- SEN support
- 6.74%
- EHC plans
- 0.65%
- English as additional language
- 14.1%
- Free school meals
- 10.3%
Ethos & heritage
- Boarding
- No
Inspection reports
- Ofsted overall
- Outstanding
- Quality of education
- Outstanding
- Behaviour & attitudes
- Outstanding
- Last inspected
- 21 March 2023
The last word
A consistently Outstanding boys' grammar where strong teaching translates into results well beyond the national norm. Families should note that competition for the 203 places, set against an already oversubscribed roll, is fierce.
The Passmate verdict
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Sir Joseph Williamson's Mathematical School 11+: frequently asked questions
Where is Sir Joseph Williamson's Mathematical School located?
Sir Joseph Williamson's Mathematical School is located at Maidstone Road, Rochester, ME1 3EL.
What type of school is Sir Joseph Williamson's Mathematical School?
Sir Joseph Williamson's Mathematical School is a state grammar school in South East.
What subjects does Sir Joseph Williamson's Mathematical School test in the 11+?
Sir Joseph Williamson's Mathematical School tests English, Maths, Non-Verbal Reasoning and Verbal Reasoning at 11+.
Which exam board does Sir Joseph Williamson's Mathematical School use for the 11+?
Sir Joseph Williamson's Mathematical School's 11+ uses GL Assessment.
How do I apply to Sir Joseph Williamson's Mathematical School?
For 2027 entry, the application deadline is 31 October 2026.
When are Sir Joseph Williamson's Mathematical School 11+ offers released?
For 2027 entry, Sir Joseph Williamson's Mathematical School releases offers on 1 March 2027.
Which consortium does Sir Joseph Williamson's Mathematical School belong to?
Sir Joseph Williamson's Mathematical School is part of the Medway Test consortium.
How many places does Sir Joseph Williamson's Mathematical School offer?
Sir Joseph Williamson's Mathematical School has a published admission number of 203 places.
How many pupils attend Sir Joseph Williamson's Mathematical School?
Sir Joseph Williamson's Mathematical School has approximately 1,528 pupils on roll.
What is Sir Joseph Williamson's Mathematical School's Ofsted rating?
Sir Joseph Williamson's Mathematical School was rated "Outstanding" by Ofsted at its inspection on 21 March 2023.
Compiled from public data. Last checked June 2026.