Some instructors will allow you to retake a quiz. The quiz will show you if you are allowed more attempts.
Note: Your instructor may be using an upgraded quiz tool called New Quizzes in your course. If the quiz you are accessing displays an assignment icon instead of a quiz icon, your instructor is using New Quizzes. Functionality may differ between these quiz types. For help with retaking quizzes, please see How do I know if I can retake an assessment in New Quizzes?.
If you can retake the quiz, you will see Take the Quiz Again button. Click the button to retake the quiz.
Contact your instructor if you have problems accessing the quiz.
Note: You can see past attempts in your quiz results.