Hi, well after reading your post I think you've done quite a bit so far to help yourself with your application which is really good. Why don't you try and get work experience in a doctor's surgery where you can carry out some doctor shadowing or in a hospital when you can do some other shadowing, because that will look good on your personal statement as well. Remember to choose the right a-levels for this course as well, the main a-levels to take are Biology Chemistry, and either maths or physics.
Good Luck x