This probably won't help, but I took chemistry at AS with OCR loved it! Even though I didn't think I would be any good at a science (my other subjects were history, english lit and geography) it was fun and challenging. Having said that, I dropped it at A2, new A Levels are replacing the old ones now and I had an AWESOME teacher... But still, I like the way OCR lays out their exam papers (lots of short answers), it makes it easier I think.
So perhaps you could consider chemistry with OCR.