Ah that reminds me of another thing. Uni's will ask for minimum requirements. These will only get you're application a chance to be looked over, you obviously then stand out more for the more grades and higher grades you have. Example is oxbridge which only ask for GCSE's in maths, english and sciences as a minimum. The average medical applicant on the other hand this year has 7 A*'s at GCSE and obviously full A's at A-level, usually four a-levels although not necessary. The average medical school whilst not requiring will obviously favour those with the most A*'s and A's. However they will also look fo diversity in you're A-level's. Obviously most people will have 2 sciences usually chemistry and biology and then either physics or maths. They then expect you to have atleast to AS an essay writing course such as english or psychology or a language which also ups you in the ranks.
Apart from you're academics they want to see you're interests as a person. That you're sociable which a doctor needs to be and not a bookworm or living in a bubble. You have actively gone and done work experience whilst managing you're time ( a part time job is helpful). They also want to know why you want to be a doctor and 'to help people' is not a valid answer as all they'll say is other proffessions such as nursing are just as equally helpful. Plus 1 out of three people put on their application that when they were 8 they burnt them selves with an iron and so wanted to become a doctor from then on. But most importantly they want to see that you truly want to be a doctor, that you not only have the skills but also the eagerness but humility to be one too.
Oh and one thing I learnt from my interview at Fitzwilliam college in Cambridge, they do not expect you yet to have that much of an idea about what type of doctor you want to be or what medicine entails as such. Sorry I keep end up writing mini-lectures down lol