The student workbook has a bar at the top of the page that is coloured as students progress through a task. Once the bar is full, students will receive a message saying, "Target Mastery has been achieved." This indicates they have completed the task. Note that if a teacher has lowered the target mastery for a task, this message will appear before the bar is full.
When the "Target Mastery has been achieved" message appears, students can click "go back to the Dashboard" so that they can choose something else to work on.