In year 13 can I apply next year for med?

You would have to be careful with your choice in med schools but I think it could be possible. Scratch UCL and Birmingham off the list though in exchange for Imperial and Glasgow or other unis which don't require biology as having done a 3rd year of A levels will put you at a greater disadvantage tbh

It would not be considerd a 3rd year of A levels!

Depending on the uni it would be, from what I remember some will allow the extra year if it's just for bio and/or chem, or to increase a grade in one subject but most won't. My point was more that the majority of med schools do not require biology when you have other sciences and so his time could be better spent.

If it were to just achieve an A2 in Biology, I don't believe it would be considered a 3rd year of study. However, as you point out, lots of med schools do not require Biology, and providing he/she has at least AAA by this summer, would be OK academically. If he/she wishes to apply to UCL or Birmingham though, it would be necessary to take it at A2 in a Gap Year and perhaps get a job as a HCA or similar. (Would of course need to contact the relevant universities to check that this would be OK).

What did you mean by HCA? I googled it but all I could find were jobs for graduates

Thanks for all the replies. I have emailed UCL and they said I would be considered if I get an A* in chem this year. But I will think about changing Birmingham. Will the UCL medical department know that I applied for physics last year at UCL. And do you guys think that I should tell the truth that I had a big change of heart this December or should I pretend that I have always wanted to apply for medicine to maximise my chances?