Being myself a student too, I can tell you some tips that have worked for many of my friends and students !
First, only go for studies when you are really willing to. Some people spend all their time in front of books trying to convince themselves that they are study much but I am opposed to this. Students you make a relaxed timetable and give sometime to the most valuable things in your life in the timetable, apart from studies. A balanced timetable is the first key to success in studies.
Second, if you have a timetable but feel bored to follow it too, then give yourself a break, do some of your favorite things and then re-start with a positive mind.
Try to have a group study with one or two of your classmates, but be careful ,choose your classmates wisely.