How to see and change student attempts on a quiz
On the course page, click Grades from the system drawer. The gradebook for the course opens in Grader report view, which lists student names down the left and all assignments across the top.
Scroll to the name of the quiz you want to make changes to and click it. An attempts page opens, displaying additional view options at the top of the page. Change any settings to customize your report. Then, click the Show Report button.
To see and change quiz data for an individual quiz attempt, click the Review attempt link for the individual student. To add comments or adjust the points received for a question, click Make comment or override mark below the question. After making your changes, click Save.