Review, review, review until it sticks in your memory. Sometimes I feel like an Alzheimer's patient while other times I feel like a Xerox machine. Eventually something will stick.
Btw, I envy people with photographic memory. I have a classmate (a hottie as a matter of fact) who has photographic memory up to 24 hrs. She'll remember 100% for 24 hrs, then 50% after 48 hrs, and 25% after 72 hrs. Basically she would study the night before for all of her exams by reading the material only once (including frickin' Anatomy!) and retain everything. So unfair.