An even better measure of how well a student really understands the lesson. It encourages and rewards a student, who tries more questions to reach and succeed at the higher difficulty levels.
After a student answers a question, the next question chosen is based on an adaptive algorithm. What that simply means is that the questions adjust in difficulty based on the student's ability.
Mastery is measured as the HIGHEST DIFFICULTY level that a student achieves for that lesson. A 4-star mastery level means they have been able to answer the most difficult questions.
Yes. While Mastery is turned on by default, teachers can turn Mastery off for a class by unchecking the box on the edit class page.