The first thing I did when I got to college was get a job. It took time away from studying, which I barely knew how to do anyway, and eventually it disqualified me from student loans—thereby requiring that I keep a job to stay in school. That wasn't my only problem, but my grades were terrible and I had to drop out to pay the rent. I fantasize about going back to my high school and writing on the blackboard my #1 piece of advice for students entering college: DO NOT GET A JOB.
Colleges need to offer "how to study" classes to college freshpeople, incorporate explicit "study skills" education components in 100-level classes ("we're only going to tell you this once, but here's what to do when your prof tells you to read 400 pages in a week..."), and offer additional coaching and counseling. I never took advantage of undergraduate advising so I didn't and still don't know what they do; maybe they cover some of this. But you sure as hell don't learn any of this in high school.
There should probably be a health component in there, too: kids don't know how to get enough sleep, or why.