I'm not sure if they have this class at your school or not, but at my school their is a studyskills class for incoming freshman it's not required or anything, but I like you was very worried about college before I even decided to join a sosrority that's why I took it. It is really helpful.
We covered study skills (obviously), but also time management, test taking and career develpoment you might want to look into seeing if that class or one like it is on your campus.
Also depending on how rigid of a person you are you might want to try to scheduke out your entire day. I tried and only lasted a few hours
List the entire day in increments of 15 minutes and put EVERYTHING in a time slot. If you can follow it..good luck, and if you do put EVERYTHING you will find a lot of extra time to veg out