They only look at the higher grade if you re-take a class so far as I know. I took child development twice, since I got a C the first time due to personal problems a few years ago and they put me down as having an A for that class since that was my grade the second time. Only thing to look out for is A&P I, you can only take it over twice I believe and after that it doesn't matter your grade they won't consider you for the program.