Know when to stop highlighting
I mean this literally and figuratively. You probably shouldn’t be highlighting the entire page in your Bio book. But you also should know when to stop studying. You’ll hit that wall where you feel like you can’t absorb anymore information. It’s like when you’re eating, and you know you can’t eat anymore.
That’s when you stop. Don’t force yourself to keep studying because you’re not going to be as productive. Put down the highlighter.