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OVER 98% PASS RATE FOR THE NCS, PCS, OCS, AND GCS EXAMS › forums › PCS Advantage › Stats question › Reply To: Stats question January 28, 2022 at 9:13 am #482307 Jessica LewisParticipant I think this website gives some good information about the differences between these three items: https://www.ncbi.nlm.nih.gov/books/NBK557491/ Basically it’s a big messy family and they all play off of one another. Not confusing at all, right?!? If this doesn’t help, shoot us another message and we can try helping in a different way!! Jessica