One thing that strikes me is the number of 10 A* prospective medics who instantly decide to go for Oxbridge? Have you checked out the style of the course? Do you want the intense scientific background they give you, as well as the lack of early clinical exposure. I'm not saying oxbridge isn't good. As we all know they're amazing institutions but you HAVE to consider:
Course Style,
City,
Other universities,
Distance from home etc
before you rush into choosing medicine at cambridge maybe you should put some more thought into it. This is a huge decision and there's no need to make it so soon, and to be honest our school had the "oxbridge preparation" and it doesn't substitute for personal research.