Thanks for the prepcast and the exam simulator. Finally decided to take the exam and passed today. The simulator is a big help. The only complained I have is that the simulator worded (proof read) much better than the real exam so had to get used to the real exam in the first portion. The is 2 or 3 questions in the exam which I don't know what they talking about. The language for the exam is very poor. Be prepared for that!
I feel doing the mock exams was very helpful to understand the prepcast and the PMBOK. Don't be discouraged if you get lower scores for the simulator in the beginning. My first try for the exam 1 and 2 is 62 and 68, which I felt pretty bad. After understanding the questions I got wrong, I got 84 and 85 for the exam 3 and 4. And I felt the real exam is easier and the right choice is obviously.
Maybe the Prepcast can add more with agile contents and servant leadership in the future. It is a big portion of the exam.
Good luck to everyone!