Words on becoming sort of addicted to studying? Watch
Know your stuff - get textbooks you like (I recommend the CGP student books for the science).
Download the Forest app - its a pomodoro timer that motivates you to revise without wasting time on your phone by growing trees - surprisingly addictive.
And if you can, find a magazine or a book that's relevant to your studies. You'll enjoy biology a lot more if you can link your study of the heart to the latest research in heart disease, for example