They seem like pretty good grades. The main thing is that you got good grades in your sciences and a fair amount of A-A*. However, it depends what university you go to in terms of if they really scrutinise gcse grades or not. Just make sure you choose reasonably A-levels. Chemistry A-level is ESSENTIAL if you want to get into a medicine course at university. You must make sure you are on the A-A* border at A-level as well. So it really does count mainly how you do at A-levels, GCSE's not so much.