10A*'s, 1A... A-level: 4 A's... Thing is. Life isn't all about results. You can have a gazillion A*'s, and still not get into medicine (I want to do medicine btw), due to some random issue. Make sure to remember of the whole picture, not just results. Results get you sorted from the rest of the pack which apply to your course as well. But in the current climate of GCSE's and A-levels getting easier, you must have something apart from grades to set you apart from the crowd, because they will have the same results as you.
Concerning medicine:
- Ace the UKCAT/BMAT
- Get some work shadowing/volunteering
- Read up on basic medical knowledge
- Write a good personal statement (TSR will help you with this)
- Do some prep for the interview, but not too much.