Being at a high performing grammar will inevitably affect context Hoghgyni. It's absolutely fair too, since this is about educational advantage and disadvantage. That's why I always find it puzzling when people on MN say 'but DC is on a bursary at his private school'. Multiple measures are being used this year in any event, but in terms of a score based on school banding, I'm told all indies are in Cat1, high achieving schools whether grammar or comp in Cat 2, middle ranking Cat 3, poor performing Cat 4 etc.