More specifically, how do they set the bar for passing? (Isn't it 180 that's passing?... I don't know too much about it) I always thought it was a bell curve distribution, like the MCAT, but that can't be right because the passing rate nationwide tends to vary from year to year, although as I understand it's generally around 92-93%. If it was a bell curve, this percentage passing would be a fixed number (like how an 8 on the MCAT is approximately the mean)... so how is a passing score determined???