Click the check box next the question set you want to delete. Next click the 'Delete Selected Sets' button.
Click a question set to see the test versions saved from the question set. Next chose the test you want to delete.
Click a test name.
Next click 'REVIEW PROBLEM SET'.
On the 'REVIEW PROBLEM SET' screen edit the 'Set Name' and click 'Rename Set' to save the new name.
Note: There are also options to edit the questions associated with the problem set.