Teachers can move students between two of their classes from the Manage Classes > Manage Students page. Click Edit for the student and change their class in the drop-down menu for their class. Then click Save.
Note: Assignments will not move with students between classes, even if the same assignment exists in the new class.
If a student who was imported with Clever switches classes, you can wait for CommonLit to automatically sync the Clever section within 48 hours.
If a student who was imported with Google Classroom switches classes, you can press the green refresh icon for his new GC class on the Manage Classes page to add him to the new class and connect him with Clever. You will need to manually delete him from his old class's Manage Students page.