May of the concepts build on each other. Often what you learn in the first week of the course carries through all the way to the end of the course. That means you have to remember what you covered from the first to the last day. With Anatomy and Physiology you also have to remember what you learned in the first course to be successful in the second course. Cramming puts things into short term memory and three days after the test all of the information is gone.
Some students find forming a study group is helpful.
Your study group should be limited to four or five at the most. Too many people and it becomes a gossip session instead of a study session. The big advantage to a study group is that it allows students to give back information as well as take in information. To often students get locked in to only receiving information and find it difficult to give information. When you are tested over the material you have to give information not receive information.