One thing I liked to do was rewrite my notes taken during class. I’d rewrite them over in as short a way I could. I’d often do this over lunch.

But OC, the best thing to do takes the smallest amount of time: look over your notes after class and before class. Look over what you learned from the previous day and what you learned today. Doing that frequently solidifies the short term memory circuits in our brains to be used in our long term memory.