Answer:
Dear (Principal's name),
Greetings. I am (Insert name and class). I would like to inform you of 3 ways online classes can be improved.
(Reason 1, 2 and 3 and make sure to elaborate.)
I hope you will take what I have suggested into consideration. Thank you for taking your time to read this letter.
Sincerely,
(Insert name)
Explanation: