Good luck OP, I'm sure you can turn it around! (Although I'd expect your A* to come from Biology as it seems by far to be your biggest strength!).
I currently have 2 B's at A-Level (Biology and Geography) and an A in English Lit AS. Need to get AAB to meet my firm, so retaking a module in Geography while I do English Lit A2.
Also started Religious Studies and Sociology AS to keep me busy, any tips on how to get a B in RS? I'd be happy with that...we've done practice essays and out of every subject I've ever done this one is the tighest for time by far! It's ridiculous, it's less than a minute per mark!