School always comes first. I had almost the same problem except i was trying to put in 60 hrs at work 12 credit hrs in school and then acthing and modeling classes as wells as modeling jobs along with playing cs in a week. I did horrible in school, so i cut my work hours, stopped playing cs for 3 semesters and quit my modeling gigs. Now, I was only take on work(still about 40 hrs) and school and CSS(only at my free times)
But as soon as i get any breaks between school you will see me in css more often, and as soon as I graduate I am going back to Acting.