A lot of college work is head work. You need to be able to, on a regular basis, use your body to be a peak performer. Exercise can be solitary or done with friends, but it needs to involve both cardiovascular activity and the use of your large muscle groups. Exercise at least three times a week for an hour. Daily is fine too.
Some exercise can be intense and some can be as relaxing as a semi-brisk walk with a friend.
Again, research says that this basic skill is important to doing well. Minimize or eliminate the use of alcohol as a drug. When utilizing alcohol, do so as a beverage to enhance a social event or a meal. Consider as often as possible alcohol-free days. The problem with alcohol used to the level of intoxication is that it not only destroys brain cells, but it takes your body too long to recuperate.