Quiz Review Options
These are the steps that should be used to show or hide marks for a quiz in Moodle.
Go to the quiz the that you are seeking to change.
Click on the "name and/or topic".
Click on the "Settings Icon" in the top right corner.
Select "Edit Settings"
Click on "Review Options"
Select "The Attempt", "Marks",and "Overall Feedback"
Select "Save and Display"