Everyone who took NCLEX, passed or not, has in some point of their exams encountered many priority questions. I am thinking that priority questions' level of difficulty is the passing mark.
If you were able to get priority questions, then you are near the passing mark. If you were given TRIAGE or more difficult questions towards the end of the exam, then you might have surpassed the passing level.
If you were given basic nursing assessment, planning, implementation towards the end of the exam, then you might have failed it.
If you answered more priority questions correctly towards the end of the exam, you might have passed or the other way around.