I wouldn't really know.
Of my subjects, I suppose that'd be Classical Civilisation, but that's not too much of a challenge. No, my challenge is handing work in on time because I am so bloody lazy.
To be honest, this thread is kinda hard to answer, because I know Hell will freeze over before I can get an A Level in Maths or Physics, so I couldn't begin to answer properly. Just as my sciencey friends couldn't cope with an English A Level. The all rounders have a better chance of answering, but even then they don't do every A Level offered.
Blah, ramble.