In Sets 1-5, there is a mastery test every four weeks: at the ends of Week 4 (which assesses the work done during weeks 1-3) and Week 8 (which assesses the work done during weeks 4-7). Set 5 has more than eight weeks of instruction, so there is a third mastery test in that set.
There are no mastery tests in the Small-Group Comprehension lessons. Use observational data from small-group sessions and IDR conferences to help make instructional decisions.