There are many sensible reasons to make a lot of friends at college. For a start, you're surrounded by intelligent people, which means that they will eventually be the ones in the best jobs.
It's not what you know, but who you know...
Moreover, they are people who will be studying alongside you, so you will have someone to help you revise. You can share books and proof-read each other's essays. Worse case scenario, you will be able to swop notes, if one of you misses a class.
All of which is not the reason that I'm recommending making friends on campus.
You are going there to gain an education, but that's much wider than the things that will result (hopefully) in a nice certificate. If this is your first time away from home, then you have a lot of memories to make, mistakes to cringe from, situations to find yourself in that you will never, ever let your parents uncover.
During this time, none of it matters, unless you have people sharing the moment with you. If only to call for an ambulance or a lawyer.
These are the sort of friendships that endure, because you've been there together and forged bonds when all the world was crashing around your ears. These are the sort of friendships where, decades on, when you're all grown up and sensible, they will still be the ones who you call at 4am because it's all gone wrong.
Of course, I'm not advocating doing anything criminal or dangerous. But if you haven't got something that those friends could potentially blackmail you with later, then you didn't explore every avenue of your college education.
Going to college or university is all about broadening your horizons and expanding your mind. Your friends add value to that. They are the ones who, after it's all over, will know what it was like to be there!
You could perhaps prepare by looking up good hangover cures and keeping the ingredients handy.