Right, let's get this straight. You do not need maths and physics at A-level to be a pilot. You most certainly do not need to do any kind of degree, let alone Aeronautical Engineering. What you do usually need for sponsorship schemes is maths, english and a science among a minimum of 5 GCSEs at grade C or above. If A-levels are required, and they often are, it's unusual to find the subjects specified.
The most important thing is that you study the subject(s) that interest you most. A good pass at something you enjoy is a lot more valuable than a scraped pass (or worse) at something you don't. A lot of people drop out of university because they were doing a course they thought they ought to rather than one they wanted to.