I'm surprised people are saying A level Maths is hard. If you practice enough questions then you can easily get an A, if you want an A* then you need to have some natural talent.
I got an A in my A-level Maths and scrapped an A in Further Maths AS.
I'm not that good at maths, I have no natural ability and don't see how the concepts work together. However I can easily say that I didn't revise for maths more than any other subject.