I have to take study breaks every 1.5 hours or so or else I go nuts...studying is tough and you have to find your own method that works well.
One thing that I do is I go through the major concepts and focus on what they do, and not their names. For eg, in bio Ill pay attention to a specific cycle in photosynthesis, and learn how it works, and then match the name to it.
What also helps me memorize a whole lot easier, is teaching someone, or going over it verbally just with a friend, or myself if need be. My friend is taking bio too (a year behind) so sometimes we get together and have these review sessions, and Ill dictate to her the material, which really helps me understand the info and drives it into my memory. Its a win/win cause she understands the basics, and I get it memorized. When exams come, Ill just "teach" it to myself. I find it works really well.
I dunno if any of these helped, but I tried. Good luck!
