A Level Maths and Further Maths

Well, from someone who didn't sit the exam, make sure your arithmetic is on point. Careless mistakes are fine, as long as you know whether there's a way to check your final answer is indeed correct with certain level of confidence (the proper term is sanity check; and re-reading your work line-by-line doesn't count, as you usually can't find any).
Other than that, have fun! That's it, really.