You can delete a group to remove the virtual student grouping assigned to a group. This deletes test data for completed test administrations.
Before you can delete a group, you must first remove all student tests from the group.
From Setup, select Groups.
Type a group name into the search field. Select the group(s) you want to delete
Click Select Tasks, select Delete Groups, and click Start.
Select the checkbox next to the group(s) that you want to delete.
Click Delete.
After you delete a group, you cannot restore it.