Make studying a priority; set aside specific times to study.
Turn electronics off.
Break up your study sessions and don't put them off until late at night.
Put a star beside what you don't know and go over those things in more detail.
Ask for help if you need it, even if it is asking someone to quiz you.

P.S. - Recopying my notes was always a great way for me to study.

Best wishes and enjoy. Learning can be fun.