Quick bit of advice - whatever flying job you are going for, do what you are good at. Nobody on this board can possibly know the strengths and weaknesses of the schools/colleges you have selected for sixth form, and your best option can only ever be to do that which you are both happy doing and are good at. A-Levels are required grade C and above, so a D in something you didn't really want to do is pretty useless for you.
I don't really follow what you mean by you having to do History instead of Physics because Maths is required.
Any A-Level means just that unless you are studying Barbie Doll Cosmetics.