Likely the earliest you would be admitted would be to the Summer cohort. I would suggest for you to apply when you are close to finishing as they only keep your application for about 1 year (if I recall correctly). Apply after you have taken your TEAS and during your last semester finishing up the pre-reqs. Then when you are done update your information. Personally, I would suggest taking the TEAS after you are done with the pre-requisite course work, so that you will score higher. The good thing is that CSUSM will let you take your TEAS an indefinite amount of times and will only count your highest score, so it is less pressure (not all nursing schools do this, some only take your first score). Good luck!