There is always a large number of people with nothing to do, looking for someone to do it with. It's easy to think that no one every does any work. But since you don't see the people at the library or studying in a non-public place, you get fooled.
Learn very quickly not to be swayed by people who want you to go do something with them, instead of the schoolwork you need to do. Many of them won't be around in a year or two because they failed out. I still remember the guy freshman year who spent the whole year demanding that the rest of us on the floor need to party more. Funny guy, really nice... but he failed out. He took two other guys with him, basically, since they lacked the willpower to say no.
If you need to work part-time, think about how to set up your schedule so it can work out easier. If you have a couple hours between each class, that's not enough time to go to a job. If you can condense them, you'll have more flexible options for working.
Learn how to manage three things: your time, your money, and your social life.
Ask for help if you need it.
Explore as many extracurricular activities as you have time for. Many won't appeal to you but some will, and you'll stick with and really enjoy those. Too many people hook up with the same exact activities they did in HS, never exploring anything else.
If you go to an expensive school and if you can manage it, see if you can finish in three years. Just look at the amount of money you will save.
Get out and meet people, and be yourself.
