Oh yes the schooling bit.
Whatever you're aiming to do, you'll need good maths and science (especially physics), under no circumstances let go of them.
Apart from that, it depends very much upon what you are aiming for. Increasingly both the services and airlines regard piloting as a postgraduate qualification, and science or engineering degrees are looked upon most highly.
If like me you fall in love with the technical side of aviation, then an aeronautics degree needs good A-levels in Maths and Physics. It doesn't stop you turning into a pilot (I have), but opens up many fascinating options - the chance to work on military or civil aircraft, spacecraft, the lot (I've done all of that).
But don't lose track of hobbies, sport, recreational flying, etc. will all do you good and anybody likely to pay for your technical or flying training will look suspiciously upon anybody who has ONLY ever done schoolwork.
G