If you're an A/A* level at GCSE then you'll probably be fine but it is not just about memorisation anymore. This was my downfall ( I got 80/80 in 2 of my gcse papers when I was in secondary) and ended up getting high B in A2 (5ums from A boundary-Damn you OCR), if I actually tried I would have probably got an A.
Honestly I'd say the content is just a step up but don't be as lazy as I was and not properly practice the formulas, easy marks right there.