Yes, I also like the idea of rewarding yourself. What would work as a reward for you?

Anyway you could make studying a bit fun? At least you can try reading what you're learning out loud, making a game of it, coming up with funny ways to remember lists, such as a funny memory to remember a definition or a funny saying to help cue your memory for a list of items. Medical students do that kind of thing. For example, to remember the 12 cranial nerves in order, the classic acrostic is "On old Olympus' towering tops, a fat-assed girl vended snowy hops"!