I feel that TDC's final mock exam is much more difficult than the real test. So if you only got 60% to 70% on the final mocks, you will most likely pass the exam. A lot of the questions are very similar to TDC's mock exams. The logical thinking and strategies explained in all of the mocks are greatly helpful. TDC's materials are well organized and easy to understand. I highly recommend using TDC's study guide. Good luck to everyone who uses TDC's study guide.