It seems impossible until it's done. I'm pleased to announce that I have achieved my PMP exam with AT score in the first attempt. I would like to thank prepcast team and author for formulating great exams simulator and smart questions.
It was really challenging to train ourselves on 252 minutes and trying to finish the real exam in 230 minutes with breaks. However, the questions that I saw in the real exam was quite similar to the simulator and it helped me to scan for key terms and land on the correct answer quicker!
For anyone who has busy schedule, and is worried that he can't always sit for 4 hours to practice these exam over the weekend, I would suggest to dedicate 2 hours each day during the week and go over 30 questions of any exam and check your wrong answer to understand your mistakes.
Best of luck for all!