Concentrate 100% on your school work while in school. I think having a high GPA would be better than sacrificing that for having organic chem. It would probably be OK to take a class during the summer or when you have a really light class load.
I know it's possible to take extra classes... I had a graduate level stats class my last semester of nursing school... just be sure you don't get a poor grade in either your nursing or extra course because that may hurt your future application.
Good luck with whatever you do
Megan
Nursing News