The advanced GRE in psychology should be taken at a time when you are at your peak of remembering the details of psychology. It is probably worthwhile going through a good introductory psychology text and your class notes to familiarize yourself with the major names, theories, etc. The Miller Analogies Test is a test of general knowledge. There are books and computer programs available to help you prepare for all of these. Letters of Recommendation .
Most graduate programs require three letters of recommendation.
This is another reason why research courses, field work, seminars and other advanced courses are important it puts you in an environment where you can become known. If you have done exceptionally well in a course, it may be worth stopping by to have a chat with the faculty member to see if a letter of recommendation might be arranged. You may also have a professor from another department who knows you well. Usually, one letter from outside the department is fine, as long as you have two psychology faculty members. Personal Statement .