Depends what grade you get for separate subjects too. Like if the A* and A were in bio and chem then that would be looked on more favourably than if the B was chem.
I know people who've been rejected from getting the right grades in the wrong subjects, if that makes sense. E.g offer was AAB and chemistry and biology needed to be an A, but they got AAB in maths biology and chemistry respectively, or something like that.
Medical schools give out more offers than they have places as they expect people to miss grades, etc, so they'll be looking for any excuse to get rid of people.
Don't take the risk!