@MichaelDavey There is not really a way to have a key in the Classic version of quizzes that does not show to the students. If you use the new version of quizzes, "New Quizzes" then there is a Grading Notes area.

New Quizzes is still very much in development but can be used if turned on. If your institution has enabled New Quizzes and you do not see it as an option when creating a quiz, this means it is not turned on in your course as it is still a feature option. Go to your course settings and then the "Feature Options" tab. Then check the box to turn on "New Quizzes". This will then give you a prompt when you create a quiz that allows you to choose if you want a classic quiz or a new one.
Hope this helps!
-Nick
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