How do I remove an assessment (i.e. test or quiz)?
You can Remove an assessment from Tests & Quizzes to clean out unneeded assessments, such as duplicate working copies or assessments published in error.
In the row of the assessment, select the checkbox in the Remove? column.
Use the Remove Selected button to delete the assessments with boxes checked in the Remove? column.
You will be presented with a warning message asking, "Are you sure you want to remove these assessments?" Select OK to confirm you wish to remove them.