Ignore all the posts that say "start revising now!"
If you make sure you understand the content, and not just memorise it, you'll only need to do past papers come exam season. Also, look up stuff outside the syllabus: not only is it interesting and will stop a levels becoming mind numbingly dull, but it will make the actual a level content seem easy!
If you're doing further maths, your normal maths shouldn't be a problem: that material should be second nature to you by the end of the year.