You need to test yourself on the information you are learning!
Just reading through it isn't enough. The skill you are trying to develop is recollection. To do this say the information over in your head, recall it without assistance and do things to make it memorable if it isn't sticking. Saying words in a funny voice is a popular choice.
Team up with friends and test each other. An exam is a test, the more training you can put in before hand the more prepared you are going to be on the day. Being able to recall information under pressure is key!