Why don’t all the jurisdictions use the same numerical score?
Individual states and provinces are responsible for regulating their professionals as they see fit. While using the same numerical score would certainly make things more understandable, the fact that jurisdictions use different scales does not alter the number of questions you need to answer correctly in order to pass. This is set nationally, and the individual jurisdiction scales are just that—different scales that describe the same passing point. Previous score reports given to candidates expressed performance in a scaled score, rather than the actual number of items answered correctly, and candidates were often confused about what this number meant.