Unfortunately, there is not a way to definte a passing score in terms of a certain number of correct items or a percentage. The passing score is a scaled score determined by sophisticated psychometrics that applies weights to questions according to difficulty. The raw passing score is established separately for each test form prior to administration and may vary slightly due to differences in form statistical properties. The raw passing score is converted to the scale score, where the passing standard remains constant at 620 out of 800-point scale.
I hope that helps and doesn't make it more confusing.
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Sandi Delack MEd, BSN, RN, NCSN-E, FNASN
Executive Director, NBCSN
sdelack@nbcsn.org------------------------------