Study in a way that you enjoy. You could watch videos and take notes, make cue cards and quiz a friend, try to teach the content to someone else, do practice questions or record yourself talking about the key points on the study design. By changing up how you study, using different methods in different places and with different people, you can help yourself not become bored with it.
Or try using something you are passionate about. If it's music, write songs about the content, if it's running, listen to your notes while you run. If it's art, paint and label your diagrams. Maybe you could write a story or create acronyms for key words and phrases.
And, take lots of breaks! Studying for hours at a time every night will decrease your productivity and leave you super bored. If you plan your time well you can just do a chunk each night, without feeling bored and lethargic.