Not sure if you're getting notifications about quiz/tests?  Good to quickly double-check:

Summary:

• • go into a lesson > hamburger icon > account settings
  • Your courses should be "immediately" (or daily or weekly)
  • All other courses should be never

What causes the change?

• • at the bottom of notifications, you have the standard option to unsubscribe
  • if going too quickly, you may accidentally click this and turn off notifications

Catching-up:

If you had to fix your settings and want to catch up on quizzes or tests where you missed notifications, just use your Dashboard to see recent activity.

• • go into a lesson > hamburger icon > View Report Dashboard.
  • You can catch all the ones requiring grading in the first box.
  • You can scan student progress that you missed in the second.