Free-150, really? I feel like that would give people a false impression of the exam, because those questions are a lot easier than even the NBME ones.
Sorry, I guess I should've clarified. That's what I meant when I wrote "not necessarily difficulty"...they are easier.
I was referring to the physical interface being the same. The real exam 'appearance' is more like UWorld/Free 150, than it is like NBME. I was skeptical about how good a predictor they are but I've read many saying that they put them in the right ball-park. Maybe it holds more true to lower/average scorers than higher scorers. After all, it's only 150 questions and I think on my printed score sheet only like ~133-135 were actually counted towards the final % (not sure why that was the case).
That being said, I wouldn't really use that to judge where I stand. I took it for the sole purpose of figuring out the testing center situation/timing, breaks, etc, as I haven't taken a prometric center test in nearly 15 years.