How many questions must be answered correctly to pass an exam?

There is NO predetermined number of questions that must be answered correctly in order to pass an exam. It is not the number of correct answers that determines whether a candidate passes, but their overall score based on the difficulty of the questions answered correctly. For additional information, read General Considerations for Setting a Passing Standard, and Equating and Scaling: Assuring the Highest Level of Fairness for Examination Programs, accessible by clicking on the “Examination Results” link from the Navigating the National Board Certification

Process page on the NCCAOM website.