Okay, I just got my NAPLEX score back today (I passed!), and I took the Pre-NAPLEX a few weeks ago. I took the pre-test before I had really studied and scored low (in part because I had distractions around me and was NOT focused). Then I studied for another two weeks and took the test on Thursday. My score was MUCH higher than the Pre-NAPLEX, and I scored well above the given range. However, I felt the questions on the pre-test were very similar in difficulty to the actual NAPLEX. Overall, I would recommend it to those who haven't tried it yet, if only to get a feel for the way the questions will be on the NAPLEX.