Ok!
That's normally the case anyway lol.
Private schools traditionally have the extremely high achievers (who scored full scholarships, go to prior education or have immensely expensive private tutors etc etc) but then there are always a few bludgers who have wealthy parents.
Selective schools are normally more evenly spread, as everyone had to be academically selected in year 7 and for most grade transfers too.
The average marks scored in the subjects, and the percentage of band 6s scored would be more accurate methinks.
I wish i went to st ives