Don't wait until the last minute to review. The earlier you begin to prepare, the better off you will be. It would be a good idea to review a general psychology textbook. This would give you an overall framework of information. Additionally, one would benefit from a commercial preperatory manual, which provides a review of topical information and practice exams.
Websites can also be a good source of information.
Please check our links page. You should first skim through the test and answer those questions that are easy to you. Then, you can go back and concentrate on the more difficult ones. This will save time for the more complex questions, while ensuring a better score since you've answered all that were easy for you. Thus, if you are able to eliminate some of the choices on a particular question, guessing every now and then would probably be to your benefit.