I think it is totally wrong to look at A level courses only as a way to then get into aviation. Ok Physics and Maths may save you some extra study time when you come to sit your ATPL's, if you do them straight after (many don't, many go to Uni etc and material does get forgotten). The only exams you need to pass to become a pilot are the ATPL exams, and good grades on a form look better. Education is more than about grades though, it is about enjoyment of the courses, and learning how to study!!!, you don't realise it at the time but the ability to obtain and access information and read around the subject is a great skill, and will help you with furter study including ATPL's!. I know far too many people that have dropped out of Uni/A levels because they hated their subjects. Get those A levels in academic subjects, I honestly haven't heard of or seen any stance of someone being preferred with Physics and Maths.
Sagey