Danny boy...
I had my heart set on an airline career from the day I started school. My intentions continued as I moved toward college. I was c**p at Maths at school but okay at everything else.
I chose Maths, Physics and English Language at A-Level. The main reason for doing Physics was because I liked it. Secondly it was a good subject to have under your belt when pressing for that airline job. Unfortunately I had to do Maths too as part of the A-Level (is this still the case??). English Language was something I had always had a knack for, that subject was the easy choice.
If you're going to become an airline pilot, (and I'm sure you will) - choose the subjects that suit you. Bear in mind the role of a pilot involves plenty of mental arithmetic, forward thinking, understanding of flight theory and everything that goes with it.
I was always told that if you had a GCSE in maths, english and science, you would always get a job, because they are "core subjects". I thought that if I had an Advanced grasp of these subjects, it would leave me in a very flexible position to go down many different routes.
For the record, I hated maths at first, but by the end of two years, if I'd have known then, what I know now.... I'd have done a degree in the flippin' subject !!
Best of luck with your A-Levels. Work hard.