You'll be fine. Just work hard next year; I keep being told that it doesn't matter what grades you have this year as long as the marks add up to the right number out of 600 next year. Plus, quite a lot of medical schoools don't look at your AS grades anymore because they know that it's hard to settle in and often people do much better in A2 year. Plus ^ there isn't really such a thing as a "top" medical school. They're all good, otherwise they wouldn't be medical schools; they're appraised and checked on by the GMC so anywhere that's a medical school is seen as good.