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1. Enter the course in Blackboard.
2. In the Control Panel, click on Grade Center > Full Grade Center.
3. Hover over the test attempt that you would like to reset, and click on the drop-down arrow.
4. Select View Grade Details.
   
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5. On the right side of the screen, click on Clear Attempt.:
   
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6. The student will be able to re-take the test.

Sources and Relevant Links

Edit Test Settings