How to submit your live test in google classroom After giving all answer, click on submit button. Then click on Open Assignment button to go google classroom mobile app. Select google classroom and click on the link with the name – always. Then click on arrow button to submit your assignment. Click on Submit button to submit your assignment. If you have online test then you donot need to attach anything, if your task is offline or given to do using any other mobile app then you need to attach screen shots.