You should know:

• how many times you can do the quiz
  Your teacher may set the quiz up so you can only do it a limited number of times
  
  
• if you have to start all over again if you redo the quiz
  Sometimes you can just build on your first try
  
  
• When the quiz has to be done.
  If it isn't clear in your course get in touch with your teacher to find out.
  
  
• If you will get less marks for second attempts.
  Ask your teacher.