Got A* at GCSE and found the first year OK, got an A at As, had to work though, no dossing like at school, but A2 was realy hard, we had a new teacher who new nothing, and I managed an U in 2 modules, getting a B overall, which is good for an Alevel chem really.
If you get an A/A* at Gcse you will be able to cope and will probs get a B/A/A* at Alevel.