PRN after 3 months

I have been working on a surgical/tele unit for 3 months now (my first job after graduation). I work nights and right now I feel a lot more confident than I would have expected. I was wondering if it would be ridiculous to switch to PRN status this early on. I really dislike the way the managers schedule people and I absolutely hate having to work every other weekend, both days. I do not enjoy this job at all and on top of that the schedule that I work makes it even worse. I cannot fathom the thought of working there longer than 6 months, however if I am able to pick the days I work (with some rules, I know) I will be able to stick it out for longer to gain the experience I need. I will still aim for working 3 12 hour shifts a week. I know a lot of people that work on my floor that are PRN status yet are still working full-time hours. The floor I am on is always short staffed, so I would not have a problem getting hours on that floor. I also do want to start taking classes for PA school soon, so working PRN will also be beneficial for that as well.