In Google Classroom, a student may create a new Google Doc as part of the process of completing an assignment. When the student opens and edits this Doc, a Turn In option is available to the left ...

You can submit an assignment in Google Classroom under the "Classwork" section on the desktop site or mobile app.

Millions of kids are now being home-schooled using a tool most people have likely never heard of.

Classroom also syncs with a number of other services, including PDF software and Google Drive, so students can turn in their projects directly from there.