Create a custom assignment where all the questions are the same and ask your students to teach the class. Choose "Same for every student" under the Question Variation option. Here's how to create a custom task: 

Assign different lessons to groups of students and give them 3 weeks to work on as a group project. 

Group students who are struggling with the same types of questions/subtopics to collaborate with one another by finding students who got the same questions wrong for an assignment.

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