There are many tips in this blog. Try using the Search box for more.
#1. Try your best.
#2. Don't get distracted (by TV, parties, even making friends, which is also important...)
#3. Make studying and going to every class your #1 priority.
#4. Take some time to socialize and join groups at school.
#5. Don't feel like you have to ask lots of questions in class. Sit on your hands if you have to, but let others have a chance.
#6. Get relationships going with other people in class, and with your teachers.
#7. Reach out for help if you need it.
#8. If you feel ignored, or if you feel you don't fit in, try #4.
#9. Get a good Calendar. Use it.
#10. Take notes or record your class lectures.
Do you have a tip you want to add? Comment below. :-)