Create a new topic called Quizzes by clicking on Add Topic, then click on the edit button next to the topic Title.
Afterwards, click on Add Activity or resource.
Select the type to be Quiz. This should take you to the quiz settings page.
Please note the following settings:
After adding the quiz, you can add the rest of the quizzes by duplicating the quiz we created previously. Afterwards, you can rename the quiz to the desired name. For example Quiz 2, Quiz 3, etc..
You should have something similar to the screenshot below: