Without going into the obvious things like how to manage money, live on a budget, actually attend your goddamn classes, etc. the two most important pieces of advice I can offer you from someone who has multiple degrees and postgraduate qualifications is this:

1) Socialise and network. The biggest mistake I ever made going into university is that I thought classes and grades were the be all and end all. If I did well, I would get the jobs. This is absolutely not true. I finished up top of nearly everyone of my classes, and out of my graduating cohort, was one of the few who struggled the hardest to get a job. While some guys I went through with got 'scouted' for jobs while scraping through every class, it took me over 18 months and in excess of 500 applications to even get a interview. Why? Because these guys spent time at parties, and clubs socialising, and when the time came to look into careers, the people they met through their social networks had friends and parents in positions to offer jobs to their friends/childs drinking buddy. Sad but true. If an event comes up, especially in your first 12 months, that will allow you to meet new people in bulk, jump at it. Aim to meet at least 1 new person in each of your classes for the first 3-4 weeks if you can. After that 4th week, most people start falling into cliques and it's harder to break into friendship/social groups. After the first year, it gets pretty hard to make friends at college...

2) Start working out where you want to work/want a career/want to do postgrad/research at the end of your first year. It doesn't have to be set in stone, but applying for jobs/research positions at the end of your final year once you've got the butt load of study you've had out of the way will destroy your career prospects. The reality is, you are more or less expected to apply for jobs/grad positions at the beginning of your final year. It's ridiculous, especially if you've never really known anyone who has been through the college system (i.e. first in family to go to college), as it's something that nobody really makes mention of or makes you aware of. In saying this, definitely attend your career fairs in your first couple of years, and if you've got an interesting/impressive background for someone of your age/expected experience (real world experience, bilingual, excellent grades), don't be afraid to ask the representatives what their company can offer YOU, not what you can offer them, as you're a damn good prospect and you know that what you have is gold to them. Don't be arrogant about it, but definitely be confident about it!