There are two kinds of quizzes:
1) The kind you get on the video pages. These are there just to help you take a step back at times during the videos (the video will pause itself at these times) and to help you think about and retain the information.
These quizzes can be taken as many times as you like and are not meant as assessment.
2) End of unit quizzes. These quizzes call on the pool of questions in the video quizzes in that section (generally a random sample).
These are assessment quizzes that require a pass.
When you pass these quizzes a badge is delivered to your Dashboard page. A final course exam is required if you want to request a certificate from Datawatch.