I like it, but you have to make sure that the topics covered are interesting to you - we studied Modern Britain 1945-1997 and I really had to struggle through that as I wasn't in the least interested. If you keep on top of things from the start and preferably read your textbook when you're given it to start with, it is very managable. Between maths and history, just do the subject that you enjoy the most at the moment. I love this year so I'd definitely say that it's worth it (studying Germany 1789-1914) but nothing's going to be fun, especially something where you have to memorise so much, if you don't like it to start with!