Don’t retake the B but understand why you didn’t receive an A… and if you don’t like Physics that might be a problem!
I wouldn’t take Pre-Calc over the summer - most math classes are best internalized over two regular semesters. No hurry to complete Calc unless it is required at your school before AP Physics. (At my daughter’s school, it was ok to take concurrently or even after Physics if strong math student.)
And think about some match schools…