To preview one question -  while on the page, select (go to) Question preview to view the question as it will be shown to the student.

 

You can answer the question and click (save) Get question points and comments to see how test engine would score and comment such answer.

 

To preview all questions in a test - go to the test details page by clicking on the test’s title in the test list. Select the test questions you want to preview from the lists of the test part contents (selecting all questions from the first test part will select all test questions) and click (go to) Preview questions. You can go to question properties view by clicking the question title on the displayed page.