Depends what country you're in really.
I'm in the UK, I have the same aspiration really, some sort of developer, it doesn't have to be games, but I'd love to of course. For my A Levels, I've taken Maths, Further Maths, Physics and Chemistry. Maths obviously has a lot to do with programming, so that was a natural choice and physics is also heavily used in game programming.
I'm hardly an expert, but I think I made the right subject choices and I hope it works out for me. Hopefully that helped a little, good luck.
Also, I see you've just joined, welcome to the forum.