what don't you like about physics? it goes well with maths, but i still think you would still be fine with doing psychology, i know plenty of people applying for medicine who aren't doing physics. Physics is quite of a difficult subject, and from what I've heard psychology is easier so it might be better for you to take psych so you can focus on getting good grades in the other subjects. especially since you're dropping it after a1, your decision won't matter too much.