It’s so different and they don’t give figures for ‘percentage students gaining at least 5 grade 4s’, etc. Also, when I started looking at private schools they throw in the old ‘IGCSEs are harder!!’ line for selected subjects, though they are still graded A*-C’, so am not even bothering to compare with them. But to make a start:
National average: 66.9% entries at 4-9, 50.3% at 5-9 (new definition of ‘good pass’.
The only consistent figure for comparison (which is still down to prior intake):
Waldegrave 44% - 7-9
Orleans Park 40% - 7-9
Grey Court 40% - 7-9
Christ’s 31% - 7-9
Teddington 28% - 7-9
(National average 20.3% - 7-9)
So above average then. You could also dig out numbers who passed English and/or Maths.