Chislehurst and Sidcup Grammar School is a secondary academy in Sidcup, London. It has not yet been rated by students on y.school. Be the first to rate this academy and help other students and parents understand what the school experience is really like.
In terms of academic performance, Chislehurst and Sidcup Grammar School has a Progress 8 score of +0.82 (above the national average), an Attainment 8 score of 76.0, 100% of students achieving grade 4+ in English and Maths, an average A-Level grade of B.
The school has a teacher turnover rate of 11.9%, 3% of pupils eligible for free school meals, an overall absence rate of 4.1%.
After leaving Chislehurst and Sidcup Grammar School, student destinations include 67% going on to university and 7% entering apprenticeships.
All student scores on y.school are calculated from anonymous ratings using a transparent, deterministic methodology. Scores are freshness-weighted (18-month half-life) and include confidence tiers based on sample size, diversity, and consistency. For full details, see the y.school methodology.
Chislehurst and Sidcup Grammar School has a Progress 8 score of +0.82, which is above the national average of 0. Progress 8 measures how much progress students make between the end of Key Stage 2 and their GCSE results, compared to students with similar starting points nationally.
The school's Attainment 8 score is 76.0. Attainment 8 measures the average achievement of students across 8 qualifications including English, Maths, three EBacc subjects, and three open group qualifications.
100% of students at Chislehurst and Sidcup Grammar School achieved grade 4 or above in both English and Maths GCSEs.
Students at Chislehurst and Sidcup Grammar School achieve an average A-Level grade of B. This metric covers all A-Level and equivalent qualifications taken at the school.
Chislehurst and Sidcup Grammar School has an overall absence rate of 4.1%. The national average for secondary schools is approximately 5.5%.
The teacher turnover rate at Chislehurst and Sidcup Grammar School is 11.9%. This measures the percentage of teachers who left the school in the past year.
3% of pupils are eligible for free school meals, which is used as a proxy for socioeconomic disadvantage.
After leaving Chislehurst and Sidcup Grammar School, 67% go on to university and 7% enter apprenticeships.
Source: Department for Education, Ofsted. Data shown for context only — does not influence the Student Score.
Data last updated: April 2026
Chislehurst and Sidcup Grammar School was rated "Good" by Ofsted following an inspection in December 2022 (3 years ago). Based on Ofsted's inspection cycle, Chislehurst and Sidcup Grammar School is due for reinspection this year (2026).
A "Good" rating means Ofsted found the school provides a high standard of education across all areas assessed. Around 65% of schools in England are rated Good, making it the most common rating.
Note: From November 2025, Ofsted replaced single-word judgements with detailed report cards covering multiple categories. While Chislehurst and Sidcup Grammar School's rating shown above was awarded under the previous system, Ofsted now provides more granular assessments. For the most up-to-date inspection information, check the school's report card on the Ofsted website.
Ofsted data is displayed for context only and does not influence the Student Score. For the official Ofsted report, visit reports.ofsted.gov.uk.
Crime Nearby
169/mo
Within ~1 mile (Police.uk)
Violent Crime
49/mo
29% of total
Air Quality
Good
NO₂: 13.7 µg/m³ · PM2.5: 7.7
Bus Stops
14
Within 500m
Nearest Station
Sidcup Rail Station
0.4km away · 2 stations nearby
Source: Police.uk, DEFRA UK-Air, DfT NaPTAN. Based on the school's location — actual conditions may vary.
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Other schools in the Sidcup area
Source: Department for Education / Ofsted. Data shown for context only — does not influence the Student Score. Small schools may show extreme percentages due to small sample sizes.