Everything in life takes time. Believe me if your ultimate goal is to become an RN, don't rush it. Don't think it will happen over night. Even if takes you 2 years, so what, you'll, hopefully, be getting all the learning experience you need to become a competent nurse.
Your questions are very specific and/or detailed. Does not your school have a website with nursing page? Usually tons of information can be found there, if not, go in and speak with an advisor. Curriculum changes each year, they may require you to take a few more classes prior to nursing courses.