Kesteven and Sleaford High School Selective Academy
School summary
A selective girls' grammar in the market town of Sleaford, Kesteven and Sleaford High stands out for the consistency of its Ofsted profile: every area inspected, from quality of education to the sixth form, was judged Outstanding. With 756 girls on a roll that has capacity for 822, the school is busy but not at full stretch, leaving a little room for growth. A pupil-to-teacher ratio of around 18 sits comfortably for a school of this size.
How hard is it to get in?
Competitive · 2 of 5 on the Passmate scale. Demand exceeds the 124 Year 7 places in most years, though less sharply than at the most oversubscribed schools.
Where every mark matters.
Places are limited and demand is high, so exam performance is what sets candidates apart. Passmate turns the months ahead into ten focused minutes a day on the exact topics this school tests.
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Latest results
Attainment 8
61.8
National average 46.9
GCSE grade 5+ (English & Maths)
85%
National average 47%
Inspection reports
- Ofsted overall
- Not judged
- Quality of education
- Outstanding
- Behaviour & attitudes
- Outstanding
- Last inspected
- 19 November 2024
Teaching & academics
Results are well ahead of the national picture. The average Attainment 8 score of 61.8 outstrips the national average of 46.9, and 85% of pupils secure grade 5 or above in English and Maths, against a national figure of 47%. An Outstanding judgement for quality of education and for the sixth form points to strong progression from Year 7 through to A level.
School life & ethos
- Boarding
- No
- SEN support
- 4.89%
- EHC plans
- 0.4%
- English as additional language
- 4.5%
- Free school meals
- 9.1%
Schools nearby
Carre's Grammar School
Sleaford, East Midlands
Kesteven and Grantham Girls' School
Grantham, East Midlands
The King's School, Grantham
Grantham, East Midlands
Bourne Grammar School
Bourne, East Midlands
The Boston Grammar School
Boston, East Midlands
Boston High School
Boston, East Midlands
Watch Passmate decide how to teach.
Answer as a child would. Left: what they see. Right: what it learns about them.
A high-performing girls' grammar with an unbroken run of Outstanding Ofsted judgements. Families willing to prepare for the GL Verbal and Non-Verbal Reasoning papers will find a school delivering results far above the national average.
That’s where Passmate comes in. Tutoring is the most effective thing in a child’s preparation - a well-tutored child can outperform the vast majority of their peers. Passmate works alongside your tutor, not instead of them: it learns how your child thinks, finds the gaps, and shows the tutor exactly where to spend each session - so the limited time you have lands on what actually decides a place.
Works alongside your child’s tutor - not instead of them.
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Kesteven and Sleaford High School Selective Academy 11+: frequently asked questions
Passmate rating: benchmarked against every selective school in England using official admissions data. It measures demand for places, not school quality. Updated July 2026.
Compiled from public data. Last checked 5 June 2026.