If the test that you have administered has not been started by any students in the class (including the instructor-student accounts) you can remove that test from your class.
To do this, from your Instructor home page, you will click on the name of the class. Then click the “Edit Class” button. Then go to the “Tests” tab and find the name of the test in the list. If no students have started the test there will be a “remove” button to the right of the test name. Click that, and the test will have been removed from your class.
If students have started the test you cannot remove that test, the "remove" button will be gone, however, you can edit the test settings and change the end date/time to the past to prevent more students from taking the test by clicking the “Edit” button and updating your settings.
You can also hide the grade from the grade book so the student's overall grade won’t be affected by the test. More information on hiding grades can be found here.
If you still have questions or concerns, please feel free to submit a help request or give Customer Support a call at (616) 818-7877.