I have heard all sorts of numbers for passing. One of my friends took the exam and got a 318/500 and failed the exam (he got a 74). All he did was go through the front (not the back) of the dental decks. He has to wait 90 days to retake it.. so, I am not really sure. If you fail the exam, apparently you get the breakdown of your failure.. maybe so you can study differently. I just took the exam and once I get the results, I will post my feedback and what I thought was the most helpful/least helpful.