This link further explains the M-STEP testing in terms easily understood by parents. Please feel free to look through it and ask questions in the comments below.
http://www.michigan.gov/documents/mde/A_parents_guide_to_Spring_2016_M-STEP_Presentation_Final_503280_7.pdf?20151022113406
http://www.michigan.gov/documents/mde/A_parents_guide_to_Spring_2016_M-STEP_Presentation_Final_503280_7.pdf?20151022113406