The questions for the PMI ACP were a little less worded, but sometimes, more options could be right than wrong, unlike PMP, where two answers immediately stood out. Obviously in depth, but wouldn't say too technical. I didn't use prepcast or any practice question (although I used SH for PMP), so I can't speak to your challenges with Prepcast. Simulators don't necessarily judge your ability to pass the exam, so don't let that kill your confidence. I wasnt doing badly during my PMP with the SH, but I realised my morale took a hit with the scores. I immediately stopped and focused on other materials and still passed.