I have used SparkCharts for several years now. They are awesome study aids. They are laminated charts that can be clipped into your binder, with a review of all the major topics for that subject. They were a life-saver while I was in Mortuary college and studying anatomy, chemistry, microbiology, psych, sociology, etc. I highly recommend these products. They by no means replace paying attention in class, but they are excellent quick reference study tools, especially for tests.