My suggestion would be to take the science courses over to boost your overall GPA. OFten Nursing schools place stronger weight on the science courses so even if you comple a BA you total GPA may not be high enough to grant your admission into an RN program. If you take the science courses in question at the same school where you last took them and receive a higher grade the old grade will cancel out. At least that's how it used to work but I haven't been in a classroom in over 14 years.
Peace and Namaste
Hppy