A. Join band XD It makes everything better.
B. Have at least one friend in every class. If you are sick, or forget to do homework, you will need them.
C. DO HOMEWORK ON TIME. Most people I know that are failing classes is because they don't do homework.
D. Only join a club if you want to, even if all of your friends are in it.
E. Try and have one friend who is a good driver and has never gotten into an accident. There might be a time you need a ride.
F. If you happen to have a day or weekend with no homework, do something you've been wanting to (cleaning, writing, etc.) before doing nothing and playing video games.
G. Have a calculater and pencil, always. Keep your phone with you if you have one.
H. Chew a unique flavor of gum while studying, and have it again while taking the test over that material.
I. Only listen to orchestral music while studying/doing homework. Try a video game playlist if you want. Lyrics can be very distracting.
J. Keep a schedule for the first week or so. If you forget what class you're going to, it could be a pretty big issue. Carry your schedule with you until your very comfortable with it.