To display the questions in random order, in the ‘Options’ tab of your quiz, you’ll find the option ‘Display Random’. You can then also select to display a fixed number of random questions. If you to display all questions, make sure the limit is bigger than the number of questions you have.
To randomize the order of the answers, in the ‘Questions’ tab of your quiz, enable the option ‘Randomize Answers Order’ below the ‘Answers’ panel of each answer. You’ll need to enable this individually, for every question you want to randomize the answers to.