The settings under Layout control the order of questions on the quiz and the number of questions that appear on a page.

Question order determines whether the questions appear in the order that you place them in while editing or in a random order. The random order will change each time the quiz is displayed. This does not allow students to share quiz answers with each other and encourages them to focus on the wording when they retake a quiz.

New page determines where page breaks will fall. It determines whether you will have a page break after every question, every two questions, and so on.

By default, all questions in a quiz are displayed on separate pages. New page breaks up the quiz into smaller pages. Moodle inserts the page breaks for you. On the Editing quiz page, you can move these page breaks. If you want to break up your quiz into pages that each hold the same number of questions, this setting will work for you. If you want each page in the quiz to hold a different number of questions, use this setting anyway and edit the page breaks that Moodle creates for you.

The Navigation method setting determines whether the student can go back and forth between questions. If this setting is set to Sequential, the student must answer the questions in order. If questions near the end of the test give clues to the answers for questions at the beginning, you might want to change this setting to Sequential. This will prevent the student from going back to early questions and using those clues at the end of the test to answer the early questions.