Get a paddle holster, and you do carry a back pack? then the gun goes in the back pack in school, when you get ready to go home, slip on the paddle and all is good. Just make damn sure that back pack goes EVERYWHERE you do once you get there, to the john, to the coffee pot, you do not ever want an uncontrolled firearm on the campus.
I had Dan Wesson 357 in my back pack the last two years in College and when I was in grad school. I got in the habit of keeping my money in the little pocket of the back pack so that I to take it with if I needed a coke or something.