(1) Desktop seems to be more stable and user-friendly than mobile. If you don't have a computer at home, make time to visit the library before//after school or during lunch to complete these assignments. You have a week to get to a computer and get these done.
(2) Do not open the quiz until you are ready to spend 5-15 minutes uninterrupted and complete it. Leaving the computer, minimizing/closing the browser, switching tabs - all of these actions have resulted in the quiz submitting automatically when you are not finished.
(3) Check the title of the quiz and have your notes ready to hand.
(4) Don't rush it. Make sure you're choosing the answer you intend.
Again, starting with the first post-Thanksgiving quiz, these grades will be recorded as earned, not for effort.