Where to find the percentile to RIT charts in the norms study.
The percentile to RIT charts can be found in Appendix C of the 2020 RIT Scale Norms Study, starting on page 109. Appendix C.1 contains the percentile charts for students, and C.2 contains the percentiles charts for schools. See MAP Growth: Where can I find the Norms Study and related documents? for a link to download the study.