Make Drive Available Offline // Google Drive
So you don't have Internet at home. Or maybe your students don't have Internet at home.
This solves the problem of not being able to work on stuff outside of Wifi.
It's like 3 clicks.
However, Google Classroom is not available outside of the Internet.
Make sure you either screenshot it or make sure it's in your Drive (probably have to open the Doc in classroom for it to generate in Drive).