I usually did 14-16 cerdit hours a semester. I always tried to take an easy class in there somewhere.
I think college is just something you dive into and you either swim or sink
12 units us a breeze..try 16-18 grad school. You can do this!!
I'm not a student any more, but when I went to college and university I got through with a lot of nose-to-the-grandstone hard-work, late-nights, a few all-nighters, and study, study, study. It helps if you're passionate about what you're studying.
Went I started in college, way back in the dark ages (the 60's) you had to take a minimum of 15 semester hours to be considered full time.
It's pretty much the same, just a bit more work. Me personally, I had to step down from 15 to 12; 15 was too much with a full time job.
I was tired, very much so.