My advice: complete as many classes as possible before applying, but who knows: you might still get in not having completed all the courses. The CSN RN program is set up in a point system, which means that individuals with the most points are the ones that will get accepted. Both Bio 224 and 251 account for 15 of the POSSIBLE 34 points at CSN (that is almost half). With the being said the more courses you complete the better your chances.