I found the support from TDC staff (Robin) before I began studying, while I was studying and had questions and after taking the exam, were extremely supportive. I had used another study program that did not work as well as this audio design. I found that the audio component worked exceedingly well. I also appreciated the explanation of how to think about the exam, how to prepare and how to be in the examination room during the actual exam. The study outline made the 4 week study plan efficient. TDC seemed more personal and interactive. My colleagues highly recommended TDC and I would highly recommend it as well. Thank you so much!