Then the adjustment for 'socio-economic factors must be simply huge.
My ds attends a small non-selective rural independent. Families are a mix of army, local professional and a small international contingent.
Every year they get 100% of pupils though GCSE English and Maths. The state school at which my ds was allocated a place got 59% through maths and 68% through English last year.
How is that the same?