Make sure you have returned all turned in work (a habit you should do every time you "grade" or look at completed assignments. Otherwise, you own the students' work and they do not.
Go to your Classroom list screen.
Find last year's Classroom(s) and click the 3 dots in the top right of the Classroom Tile.
Choose "Archive" on the next screen.
If you want these directions in a Document click HERE!