A Class can only be deleted if it does not contain any students.
If you make too many Classes in your Subject or you no longer need to use a Class for differentiation, then it can be deleted from the Students page.
On the Students page of your Subject, select the Class you want to delete. Click the Delete class button located above the Class code.
This button will not be available if there are students in the Class. The Class can be archived in order to preserve the student work, or you can move the student into another Class if they still need access to the Subject. Archiving the Class preserves all student work and teacher feedback, removes the subject from students' home page, and frees up the Markbook.
You may also be interested in the following resources: