And why are you concerned about what the "pass" mark is? Create a goal for yourself based on what your aspirations are, and set that as your own personal "pass". Surely you're not aiming just to pass Step I...?
(Yes, yes, I realize we all just want to pass and it's a hard test and all that, but realistically your own performance goal should be centered around something more than just that arbitrary, low, bare minimum score to pass)