How do I add or remove students from Google Classroom rosters?

Students can be added or removed in Google Classroom

Any changes you make in your Google Classroom rosters will automatically appear in Notebook. If you do not see your changes right away, log out of Notebook and log back in with Google.

Any student work that students have already completed will remain in the original class they were in, even if they are moved into a new class. Group work they have completed will remain in the original group's assignment.