I'd like to use some assignments on Khan to review skills that some students may have learned last year. When most of them log in, these assignments show up as completed with zero exercise minutes on their Activity Log. So I assume these students did the lesson in a prior year.
If I want to have them do the lesson again, how to I clear & reset it so that they are really getting a review? I've deleted the assignment & reassigned...when they log in the work still immediately shows as being done.
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