Hi Angie,
In the past, 61% was published by PMI as the passing score for the PMP Exam (which means that PMP aspirants need to correctly answer 106 or more PMP® questions out of the 175 real questions). In fact, PMI played around with the passing score several times. It once set the passing score to 81% in 2005 and the number of candidates who could make it dropped dramatically, leading PMI to reset it to 61% in just a few months. At that time, PMP candidates would get a report card with score (in percentage) for correctly answering questions in each domain.
But no more now. From December 2005, PMI ceased to publish the passing score as it has adopted a more “scientific” approach to judge whether a PMP aspirant is eligible for the PMP title. Later, the PMP Exam report card was revised in 2007 to give only the proficiency levels (i.e. Proficient, Moderately Proficient and Below Proficient).
Basically, what I meant by that paragraph is that the passing score for every candidate is different. As no two PMP aspirants receive the same set of PMP exam questions, setting a definite passing score for the PMP exam is not fair to the candidate who, unfortunately, receive more the “difficult” questions. The statistic model, termed as psychometric analysis, is used to calculate the passing score of each individual set of PMP exam questions to make sure the “difficulty to pass the PMP exam” is similar for each individual candidate.
Therefore, as a general guideline, if you could get over 75%-80% for each new set of PMP sample exams you have answered, you can almost be assured of a pass in the real PMP exam provided that you perform normally during the exam.
Hope this helps.