Chislehurst and Sidcup Grammar SchoolBlackfen School for Girls
Inspection, results, pupils and attendance side by side in Sidcup.
Summary of the comparison
Chislehurst and Sidcup Grammar School and Blackfen School for Girls are secondary schools in Sidcup.
Chislehurst and Sidcup Grammar School scores 78 out of 100 (grade B, strong) and Blackfen School for Girls scores 56 out of 100 (grade C, average). Chislehurst and Sidcup Grammar School is ahead on our composite score.
Chislehurst and Sidcup Grammar School was judged Good and Blackfen School for Girls was judged the expected standard.
On GCSE Attainment 8, the latest published figures are 75.6 for Chislehurst and Sidcup Grammar School and 44.1 for Blackfen School for Girls.
GCSE Attainment 8 has held broadly level at Chislehurst and Sidcup Grammar School (75.0 in 2021-22, 75.6 in 2024-25) and has fallen at Blackfen School for Girls (47.8 in 2021-22, 44.1 in 2024-25).
Side-by-side comparison
| Measure | SidcupChislehurst and Sidcup Grammar School | SidcupBlackfen School for Girls | England average |
|---|---|---|---|
| Overview | |||
| Our score | B78/100Stronger figure | C56/100 | |
| Local ranking | 3rd of 16 in Bexley Stronger figure | 10th of 16 in Bexley | |
| Inspection | Ofsted: Good | Ofsted: Good | |
| School type | Academy converter | Academy converter | |
| Phase | Secondary | Secondary | |
| Age range | 11-18 | 11-18 | |
| Gender | Mixed | Girls | |
| Pupils on roll | 1,517 | 1,402 | |
| Capacity | 1,344 | 1,500 | |
| Location | Sidcup, DA15 9AG | Sidcup, DA15 9NU | |
| GCSE results | |||
| Attainment 8 | 75.6 Stronger figure | 44.1 | 46.0 |
| Grade 5+ in English & maths | 98.9% Stronger figure | 38.6% | 45.4% |
| Grade 4+ in English & maths | 99.5% Stronger figure | 61.0% | 64.8% |
| Entering EBacc | 95.8% Stronger figure | 21.9% | 40.5% |
| EBacc average point score | 7.47 Stronger figure | 3.63 | 4.09 |
| Cohort | 189 | 228 | |
| A-level results | |||
| A-level entries | 258 | 135 | |
| A-level average points | 41.2 Stronger figure | 34.0 | 35.0 |
| A-level average grade | B | C+ | |
| Best 3 A-levels points | 41.3 Stronger figure | 34.7 | 35.8 |
| AAB+ incl. facilitating subjects | 27.2% Stronger figure | 2.8% | 17.5% |
| Pupils | |||
| Pupils in the census | 1,517 | 1,402 | |
| Free school meals (ever 6) | 4.8% | 19.4% | |
| English as an additional language | 10.9% | 16.6% | |
| SEN support | 0.5% | 6.3% | |
| SEN with an EHC plan | 0.5% | 3.6% | |
| Attendance | |||
| Overall absence | 3.8% Stronger figure | 9.8% | 6.2% |
| Persistent absence | 4.9% Stronger figure | 27.6% | 15.8% |
marks the stronger figure on measures with a clear direction. Rows describing a school's intake, such as free school meals, English as an additional language and SEN, carry no marker: they describe who a school serves, not how well it serves them.
Historical trends
Each solid line is one school; the dashed line is the national average.
GCSE Attainment 8
GCSE Progress 8
A-level average points
Overall absence
Free school meal eligibility (ever 6)
Pupils on roll
Ethnicity over time
One panel per school: the largest groups across this comparison, one colour per group, on a shared scale.
Chislehurst and Sidcup Grammar School
Blackfen School for Girls
Full profiles: Chislehurst and Sidcup Grammar School · Blackfen School for Girls