Passed my PMP yesterday and thought I would share my lessons learned. I found the questions on the pm precast exam simulator to be very close to what was on the actual test. I will say I thought the exam questions were a bit harder, I could usually narrow it down to 2 different answers but definitely had some trouble picking from the last 2. My scores on the exam simulator were 81.5, 74.5, 81.5, 78, 85.5, 79.5, and 77. The exam simulator was by far the best way to prepare for the exam, doing as many practice questions as possible will help you prepare more than anything else.
Looking back on what I wish I had studied more or less I would say understanding the change control procedure, the difference between communications management and stakeholder management/engagement. I thought there were lots of questions asking about what to do when projects go wrong, how best to communicate to stakeholders, what's the proper procedure, what could have been forgotten to create this problem. Also I had almost no formula questions, less then 10 for the whole exam and they pretty simple ones.
Overall I think the most important thing is to do as many practice questions as possible and review the exams. When you are actually writing the exam read the questions more then once, don't get flustered if you don't know the answer right away, really trust your preparation and for the questions your not sure about trust your gut on what you think is the right answer.