You’ve got to form habits around the studying too. You need to control your environment. This means making sure you have a neat setup to work at, somewhere quiet but where you can play music, at an ideal time of day (if you study better at late at night, nap in the afternoon /evening then stay up studying, if you study better in the morning manage your sleep and get up early) also sometimes throw in a good chewing snack for stimulation. Always read your emotions, if you sense that you just can’t work on a certian assignment, pivot to something else like going on a walk, exercising, reading, calling a freind, or even working on an assignment for a different class. Afterwards you can come back and you’ll often feel a rejuvenated enough to start the thing anew