Depends what for. You will be taught everything you need to know as you go along.
If you are talking about preparation for an integrated school's testing procedure, then the 'hardest' maths question you will get is the most basic GCSE stuff (trig) and Physics is Key stage 3 - Newtons laws of motion.
Things that threw me though (still passed though) - was knowing what the top number means in the periodic table. Was it no of protons or neutrons - whatever.
Learn long division!
Hope that helps