HesMyLobster if it's 100% non-selective then those results are good though. It's a different type of intake.
Because DSs' and DD's schools are partially selective, they have the whole range of ability, but a disproportionate amount of students are at the top end.
It has worked for DS2 (got a selective place, taught with a whole bunch of other highly able pupils), and seems to be working for DD and DS3 (non-selective places, average in their year groups at those schools but will probably get 6s and 7s).