To archive a class that you no longer are actively maintaining--
Choose CLASSES from the blue ribbon.
Choose the class from the left column you'd like to archive.
Choose Settings from the middle column.
Click on ARCHIVE to delete the class.
Keep in mind that students will no longer be able to log in to that class and do work.
If you want a new class, be sure to add the students to the new class. The progress within each skill will follow that user to the new class.