Before using TDC, I had been using AATBS tests and a Grossman study guide. I was relieved when Amanda explained the flaws in those tests. I also really appreciated all of the study tips, the audio rationales, and the organization in studying provided by TDC. It made studying much more manageable; I had a more concrete framework to study from and was able to take the salient points from all the different areas of study and commit them to memory. It made me feel more confident going into the test and more confident in my clinical knowledge.