Q: students reported that he could not open the quiz for a new attempt because it said he has an “attempt in progress” and “time exceeded”.  How do I clear these hidden (to me) open attempts.
How do I submit (finish) the quiz for the user?

A:
Go to your quiz. Open the quiz

select Grade in the scroll down menue

make sure it is restricted to “all users,” hit magnifying glass.

check boxes in front of the attempts which need to be deleted and click on the trash can.

To submit (finish) the attempt for the user, watch for the following icon and click on it: