I'm in the same position! Got 12A*s GCSE, all the stuff needed to get into medicine- sport, volunteering, work experience but I'm almost certain I've screwed up my exams except maths from lack of work. I'm hoping for good predicted grades despite crap AS because although I've not worked enough for the real things I've worked hard all year so 90% end of unit tests at A grade. Can't believe I'm so stupid to have mucked around for the real exams and been great the rest of the year....