Hey There! Good luck to you! I dont think it will hurt to retake your classes, however, just double check that repeats are accepted. I repeated Physiology because I received a B and wanted an A only to find out that the college I was applying too didnt accepted repeats of ANY science pre-reqs. I had to reapply to different schools. So I think its fine, but just make sure that your school accepts science repeats! Its so competitive now days!