From within your Brightspace course, select Course Admin from the main navigation bar.
Then select Quizzes from the list of options.
From the list of quizzes that appear, find the quiz title you are interested in re-grading. Do not select the title. Instead, select the chevron (drop-down arrow).
Select Grade from the list that appears.
Select the QUESTIONS tab near the top of the page.
Select UPDATE ALL ATTEMPTS.
Under Questions that are not in the quiz anymore, select the text of the question
On the Update All Attempts screen, scroll down the page to indicate the CORRECT answers for quizzes already submitted and how much each correct question is worth. For example, in the screen shot below, the question is worth 1 point, so part of the question ordered correctly would be worth 0.33 of a point.
It is a good idea to scroll down to the Comment box and write a brief explanation for students to explain why the change to the quiz has been made.
When you have completed the previous two steps, select the SAVE button at the bottom of your screen.
Then select YES on the Confirmation window.
Then select GO BACK TO QUESTIONS button.
Now select the USERS tab.
Ensure all the attempts have a check mark in the Published column.
Then select SAVE AND CLOSE button at the bottom of your screen. The quizzes should be updated and the grades republished to the GradeBook in Brightspace.