My teachers were very understanding when I was still in school and would let me pump whenever I needed to.
I always made sure to pump or feed my son before going to class.
Except, where I was taking my classes they had Child Development,Child Care,and Parenting..So I was able to pump in an area designed for breastfeeding purposes.
Maybe you can talk to someone and have somewhere you can pump each time you need to?
I would suggest asking the office, they might give you a private space to pump or have someone vacate an office for you.
Also I had to pump while traveling, in the middle of an airport! I found using a big nursing cover or my favorite the nursing scarves where perfect. People simply assumed I was quietly breastfeeding and left me alone.
You can also get car adaptors for your breast pump for around $20 so if you have access to a car you can pump in there.
Best of luck!
Talk to the office or nurse place on campus they might have suggestions. Having a nursing cover and either Clip down tanks or something to cover your stomach/back is good. I pumped in work vans sometimes with 5 others in them haha. I got so good no one really noticed what I was doing unless they heard the sound or saw me bring a bottle of milk out from under the cover haha.