PCAT

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Anybody has more experience about PCAT. Please share with me. how they count percentile?
A percentile is an indication of how well you did relative to your peers. So let's say 100 people took the PCAT. If you score in the 50th percentile, that means 50 people did better than you and 50 people did worse than you. Likewise, if you score in the 90th percentile, that means 10 people did better than you and 90 people did worse than you. In this way a percentile tank helps account for the exam being a little harder or a little easier from year to year.