I want to do law at uni too! I'm an AS student and I'm taking Government and Politics, History, English Language and Psychology. I spoke with a couple of uni's before I picked them and they really liked my choices (although at the time I was choosing between maths and English and they said both would be fine). I really really recommend government and politics for law because it gives a basis of the law without you actually taking law, I also find it really interesting. Psychology is also really useful I think, or at least on my course, as we do about eye witness testimony and the reliability of it, as well as the effects of an authority figure on obedience and other topics that are relevant to law. History and English are obvious although, in my English at least, we do language and occupation and look into legal language and the structure of legal documents, but you'd have to check with your sixth form on this and whether you do this on that course. Another thing I'd really recommend as well is that you join any debating club or anything at sixth form. I do think tank (basically debate anything, the last one was 'should prostitution be legalised?) , debating club and law society which are all really useful. Hope this helps, good luck and any questions you want to ask me feel free to xx