I can't remember exactly how long I studied for this test, but it was probably about 25 or 30 hours. There's a study guide that can be purchased as an accompaniment to the Experimental Psychology book, and I bought that specifically for the practice tests that it includes. I have found that the practice tests that come with Excelsior's Content Outlines are useful, but should not be considered indicators of when one is ready to take the exam, and I wanted an additional resource to help me gauge my knowledge of the material. I always dislike when I have to study for a subject that I can't use InstantCert for, because the big challenge is to find a way to identify the information that will be covered on the test. The best combination is to be able to use InstantCert and practice tests that are geared toward the exam, but with Research Methods, neither of these is available.