You can delete quizzes created with New Quizzes from your course.
Deleting a quiz removes it completely from your course. If you would rather hide the quiz or make it inaccessible to submissions, you modify the accessibility dates. If the quiz has no student submissions, you can unpublish the quiz.
When Multiple Grading Periods are enabled in a course, you cannot delete individual quizzes for any student, group, or section in a closed grading period.
In Course Navigation, click the Quizzes link.
Find the quiz you want to delete .
To delete the quiz, click the Options icon  and click the Delete option .
To delete the quiz, click the OK button . To edit your quiz in another manner, click the Cancel button .