A: Most states created / use these standardized tests to comply with the No Child Left Behind Act and/or Every Student Succeeds Act, and those laws do not require that states calculate and provide percentile scores. Furthermore, and this gets a little technical/statistical, most state standardized tests are criterion-referenced tests, as compared to norm-referenced tests. Generally, states offer criterion-referenced tests because the state's goal is to see how many takers of the test simply pass - kind of like a driver's license exam. But at PeerPower we learned that percentile scores are good predictors of life outcomes, so we started PeerPower.