Mathspace will go through and make suggestions for the students to work on subtopics based on previous work they have been completed. So, if a student has completed all the work assigned to them and wants to continue doing more, they can use the "Recommended Subtopics" section to work on other subtopics that are appropriate for their level. 

The idea behind this, is that students will always have something to continue on with, even if the teachers hasn't assigned anything to them. 

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