I went to a gun-friendly college, and never felt that I was in danger. Hmm, imagine that.
You're definitely not in the best neighborhood, so keep your head on a swivel. If your face is down in your phone and your earbuds are in, you look like an easy target. The more aware and prepared you appear, the harder of a target you will seem like.
Pepper spray and a light are great options, as already mentioned. I would avoid blade fighting if at all possible (just my preference). Krav is fantastic (I picked that up my senior year in college).
Become intimately familiar with your surroundings. Know every building, every street, every police station, anywhere you might be able to run for help. Also know when something is out of place. Know which streets are lit at night and which are dark. Try not to establish patterns in your travel routes/times (sometimes this is hard with a class schedule). Situational awareness is king.
Lastly, since your campus is "gun free" it may become an easy target for violence in the form of an active shooter. Play the what-if game for every classroom you sit in. Know your primary and secondary exit routes. If you have to jump out a window, what will you land on? Where will you go from there? Have a plan to blockade the classroom door. Carry a tourniquet, Israeli bandage, and combat gauze in your school bag. Have a plan to fight back. Rehearse it in your head every time you sit down in class. What if the attack comes from within the room (classmate)? Know the room number so you can call the police for help (have the campus police phone number stored in your phone). Count the number of people in the room before class starts. Look around and see who looks like they may be helpful to you in an emergency. Look around and see who is totally oblivious.
The list goes on, but the common denominator is that everything comes down to mindset more than equipment. Good luck in your studies!!