I've personally found that the more I have going on, the harder it is for me to procrastinate. I worked two jobs and went to school full-time during undergrad and had the best GPA those semesters. The semester I had a small course load (13 units) and only worked 15hrs/wk, I didn't do as well because I kept putting schoolwork off.
As a scribe now, I definitely think it's doable to work part-time and still go to school full-time. The good thing about scribe shifts is they're usually big blocks of time (9-12hrs), so once you leave the hospital, you can focus on other things. Feel free to PM me if you want more details.