To delete a class:
Go to your Classes page.
Select the bubble next to the class you want to delete.
At the bottom, click "Archive" and confirm.
At the top of the page toggle "Show Archived" to green
Select the bubble next to the class you want to delete and select "delete"
Confirm that you want to delete the class - this action cannot be undone.
Note: This will remove all the students from your class and unlink their data from your Tracker. The students will still have Formative accounts and you or your colleagues can still have them join other classes you create!