opinion about A2 subjects

I recently got my results for my January exam results. I got an A for bio unit 2&4, chem unit 3 and physics unit 3. I got bs for bio unit 3, physics unit 2 and maths c34, but got a C for chem unit 2 and two Us for chem unit 4 and physics unit 4. it was a little bit disappointing but when I add up my marks for As level I got an A for physics and bio but got a b for chem. I am thinking of dropping physics for A2 as I feel like I need to focus more for my chem as it is an important subject for med school. So is it advisable to drop physics or?
And sorry for the long post.

It depends on your uni options. Most people only take 3 A2s (and I believe you're taking four AS: physics, bio, maths, chem) so it wouldn't hurt to drop one. At the same time, I believe that chem is only compulsory for some med schools, and you seem to be doing worse in chem than physics. At the end of the day you need three good grades, not 4 average grades, and a C + U in chem (even if it's a B overall) would send my alarm bells ringing. Check what unis you want to apply for and their requirements - do they actually want chem, or would you be better off doing physics and getting a higher grade? If chem is required, then dropping physics is probs your best bet, because you'd need to pull the chem up a lot.