Take this from me. School essentially requires 30-50 hours a week of my time (on a 14-to-16-credit schedule). And, get this. You're required to think (usually). Work is just a regurgitation of past knowledge most of the time. So props to anyone who can handle both FT school AND FT work without failing any classes.
I just PT work and focus on school. There is no room for a girlfriend mostly due to external activities... so you can forget about having one if you do FT work & school, as numist says.
Good luck dude.