Hello Robert,
My PMP exam was in late January 2023. It's difficult to compare the two systems' results, since in the PrepCast exam simulator you see your score represented by a percentage, while after the real exam you only see whether you passed/failed, accompanied by a visual representation of your overall score relative to 'Needs Improvement', 'Below Target', 'Target', and 'Above Target'. (The first of those segments are failing scores, the second two are passing scores.)
In the practice exams, taken in the four weeks before my PMP exam, my scores went from 72.2% to 83.3% (all passes). By the fourth one, I was feeling pretty comfortable with the subject areas. During the real PMP exam, I found the questions tougher to answer but ended up getting an overall Above Target score, with AT in all three areas (People, Process, and Business Environment). The visual representation put my overall score line at about 1/3 of the way above the Above Target threshold, so I was very happy with my result.
My advice would be to take each person's reported experience as "anecdata" rather than objective facts on which to base your own plan. In my study group, others who passed found the real exam easier than the PrepCast exam simulator, so perceptions can be very different from candidate to candidate..
If you're feeling familiar with the subject matter and know that you've done good preparation work, don't be demotivated by your simulator scores if they're not as high as you'd hope. If you are passing the simulator exams, you're even more likely to be successful on the day, so go for it! Learn from all the exam question solutions and the overall experience and go into the PMP exam with confidence.
Also, if you haven't already, check out the PMP Exam Lessons Learned section in this Forum to read in more detail about people's recent experiences in the exam and our recommendations about how to prepare optimally.