1. The first step to add an existing Quiz to the Grade Book is to open the course Homepage and click Grades.

2. Click Quizzes

3. Locate and click the Quiz you want to add to the Grade Book

4. Click Not in Grade Book.

5. Click Edit or Link to Existing

6. This automatically creates a Grade Book Item with the quiz's title. 

7. If you are using Grade Categories, click Choose Grade Category,

8. Click the correct Grade Category.

9. If you would rather link the quiz to an already existing Grade Item, click Link to an existing grade item and select the correct item.

10. Click OK

11. Click and assign Points

12. Click Save and Close.

13. Click Grades

14. Click Grades

15. Under Manage Grades, scroll down and find the newly added quiz.
That's it. You're done.

Interactive tutorial