I just took it the other day, and it's a hard test. I don't know if I passed yet or not. I did mksap once in residency, then uworld towards the end of residency, and finished in 2wk dedicated, followed by uworld incorrect and another mksap pass through. I got about mid 60s for each first pass.
Sounds like some people just did uworld in years prior on here, and maybe 45% is enough. I don't know. Worst case scenario, if you need board certification for a job, is just do another year of residency somewhere, and rest the 7 year clock. (I think this is how it works based on this forum, if someone can confirm)