I think I understand.....
The SAT has such a low ceiling so it is hard to determine highly advanced skills whereas other test can allow a student move grade levels ahead and further seperate them from normal. Right???
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Check out your test sheets, on occasion a perfect score will have a percentile at the 95th or even lower.

Does this happen because 5% of the kids who took the test also had perfect scores?
Thanks for your feed back!
All this percentile stuff goes right over my head. laugh