College will be a completely different experience than high school, both in and out of the classroom. In addition to social changes, you will find that classes are more difficult and move more quickly, that professors expect more from students, and that your old study habits won't be adequate if you want to earn good grades. At the same time, you are more mature, more flexible, and more goal-oriented than you were in high school, so with a little preparation these challenges will all be manageable.