Northwest Evaluation Association (NWEA), creator of Measures of Academic Progress (MAP) provides a page of resources for Parents and Students (link- http://www.nwea.org/resources-parents-and-students) and a page about assessments (link- http://www.nwea.org/products-services/assessments). You may wish to follow the links and find the page of MAP scoring for Mathematics, which explains understanding Rausch unit (RIT) scale and interpreting scores. There are downloadable RIT charts.

Lots of good info there.