I suggest Biology, Math, French and Economics.
I do politics and lit but they don't seem very relevant to you.
And my friend does French, she's getting on swimmingly. As long as you work hard, you'll do fine. Watch lots of movies over summer, read a book or two (I recommend A Little Prince, VERY good). Listen to some French music, Edith Piaf is a personal favourite but there's plenty so you find whatever.
Also, even if you get a B in gcse math, don't let that put you off doing math at A level. Just work on your A/A* topics over summer so when you begin year 12, you'll know what you're doing. They usually do tests at the start to see whether you're capable of doing AS math so be prepared. My friend got a B and he's doing really well (trustttt me though, he worked his butt off for that B in the AS math mocks)
So ye, good luck^_^