How do I manually grade quiz questions?
First go to the Quizzes tool.
Manually Grade a Quiz
(optional / recommended) associate your course discussions, quizzes and assignments to grade items. You may enter scores and feedback for an activity associated to grades, at the activity location rather than at the Grades tool. Those scores will then be visible at the associated Grade item.
Note: do not edit questions on a quiz currently in progress. Please see how to update a quiz question with an error.