Time management. Hands down, this is the most difficult thing I've been faced with thus far. Whereas in high school you did the majority of your work in class and what was left over ended up being homework, college is precisely the opposite. The bulk of the work you do in college is done outside of class with class lectures or discussions taking place over the course a a short single period (for every class 50 minute class you have, expect to do about 3hrs of work on your own time).
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