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Chemistry or Physics with foundation year

I've got an interest in both Chemistry and Physics but I don't take Maths or Physics and I'm wondering which one to take at Southampton Uni. At I got A*'s in Chemistry and Biology and A's in Physics and Maths and I'm unsure whether I will struggle with the maths content at University? I want to become an airline pilot, maritime captain or go into management and would it be better having a degree in Chemistry (which I feel I might be able to do better at) or a Physics degree which would probably be more suited to aviation?
All help greatly appreciated