I was afraid someone would ask that. 🙂 This is something I don’t feel like I have a good handle on yet. Drawing largely on some things I’ve read here on the forum, I emphasize active engagement of the memory rather than passive reading and rereading. I give students review sheets with questions and tell them to write the answers using information from their texts, in-class review, etc. (depending on the class). Then I advise them to cover the answers and go over the questions to see what they can remember without looking. Students can quiz each other, too. Along with some variations on this theme, this is the main thing I’ve been trying. It seems to be beneficial.
I’d be interested to hear what works for others.