Click the "View your work" button in the "Classwork" section to check out all your assignments for that class.
Check out your "Assigned", "Returned with a grade", and "Missing work" for that class.
TO-DO LIST FOR ALL CLASSES
To see a "To-do list" for all of your Google Classrooms, click the three stacked lines in the upper right corner of Google Classroom and then select "To-do."
GOOGLE CLASSROOM CALENDAR
See your assignments listed by due date in a calendar view. Click the three stacked lines in the upper left corner in Classroom. Then, select "Calendar."
This video walks you through the steps of turning in an assignment in Google Classroom.