The Hand-in page shows you up-to-date information each week about the status of homework completion for each student and the class as a whole. Here you can see who has finished their work ahead of schedule and also any students who have not done their homework before the due date. The filters at the top allow you to narrow down the view, to see students who have not started their homework, who have not completed their homework, who have completed any optional packages, and who have any bookwork alerts.
You can freely navigate to any historic homework in the academic year, but you'll also see a snapshot of previous homework history for each students, for upto 6 weeks, and clicking on any of these to go to the hand in page for that week.
You can view hand-in information for any class by using the More Classes search tab at the top of the screen.