I am also aiming to do Law at uni but I am already doing a levels and I advise you to change your subject, I am repeating my alevels as I got ccd last year but I did Alevel law last year and found universities and against it and can discriminate against studying it. Uni's say that law teaches things that give a artificial account to how laws work etc and it is totally different at degree level. Its a huge risk as some uni's may reject you straight out I suggest you try pick english lit, a science or sociology to be on the safe side.