Previewing the Quiz
To preview the quiz as a student go to the Assessments > Quizzes. There will be a list of the quizzes, to preview the quiz use the pulldown arrow to the right of the quiz title, select Preview.
Updating Questions
If you need to update or change a question simply go into the quiz and select Add/Edit Questions... click on the questions you want to edit, and edit. When the question is saved it will ask if you want to update the question in the quiz only or within the Question Library as well, make sure and update the question in both places!