Bonus aviation at Cranfield?
I remember doing my PPL exams at the same time as my AS's, did my human factors exam on the same day as Pure Maths! (airfield and school were conveniently next door to each other). Was a pain because I found the aviation stuff a hell of a lot more interesting than anything I was 'supposed' to be learning. Sorry and now to the point: if you find the stuff interesting then it shouldn't really be a chore but concentrate on your GCSE's I'm sure pruner's that fly for the airlines will agree that a good set of GCSE passes are for more important than getting solo on your 16th birthday.