You are allowed 3 total attempts per quiz or exam. After you take the first quiz and you are not happy with your grade please look over your quiz and make sure you understand the ones you missed. If you do not understand them:

Review the course lesson prior to the quiz.
Still confused, post your question to the appropriate discussion. (Working on 2.1, post to Module 02: Questions and Discussion).
No help there? Call, e-mail, or Zoom me!

Once you are ready to retake the quiz/exam go ahead and retake.

If you still are not happy with your score, you need to look at the questions you missed and make sure you understand them. Use the discussions and/or set up a meeting with me to go over the topic. Then, email me to open it for the third time.