In three (3) of the sections, the student only has to do three (3) activities and the remaining three are not available as they are not used for the class.

In the SS 1.4 section, all six (6) activities can be seen. The others do not have all six (6) activities.

Since all six (6) are not completed, it has not been mastered. After mastering the three (3) available sections, no further action is needed.