The prep cast simulator gets you ready on situational questions, which are the main bulk (more than 90%) of my PMP exam. In my exam, there are only 2 calculations, and only 1 on float. But towards 150 qns till 200, the questions gets tougher, the situational questions are 3 ~ 4 lines long, and all the 4 answers are long sentences. It's highly recommended to finish the first part (1st 90 qns) including review in under 110 mins, hence for the 2nd part, you have the balance of 130 mins for 110 qns. The first part is not as wordy and there are no calculations. I wanted to save more time going into 2nd part thinking there would be calculations questions, there are only a few, BUT those long questions took a lot of time to read and re-read!! My confidence dipped when I was answering those questions, because I was not 100% sure. Such long questions do appear in the simulator exam, but not as many. Hence 1 way to learn is to do more questions, exams or learning does not matter. Be sure to read the explanations. I find it very useful to read the explanations even for those I got correct. So I learned and understood the correct technique to answer.
Good luck!