Well, I have done both Eng lit and History at A level and I found them okay. BUT, it all depends on your ability and the effort you put in.
If you are asking about those subjects put together as a combination of what you will study, then I'd say they are pretty academic subjects and they can be difficult, particularly Maths and Biology. Meaning you will have to put a LOT of work in. But then, saying that you have to put a lot of effort in for any subjects at a level.
Also, all of those subjects that you have listed are very different to what they are at GCSE level.
I hope I haven't put you off! Its just that it depends really. Put effort in and you will be fine. Don't do the work and be lazy=be doomed.