iready 5th grade math book National Norms for Reading and Mathematics for Grades K-8: 2020-2021 4 : 10 20 30 40 50 60: Table 2 Winter : i-Ready Diagnostic : for Reading Percentile to Overall Score Conversion : For Diagnostics taken between November 16 and March 1 Note: Analyses were based on the 2018-2019 academic year.