Another method would be to have individual variables managing each question, then set the Next button with conditions set for each individual variable. If all are correct, you receive a correct message (using an action), then proceed after a slight delay. If incorrect, you get an incorrect message (using an action) and do not proceed. In essence, you are separating the questions, although they appear on the same page.You could also include individual actions for each question with conditions, noting which question was and was not answered correctly, and an appropriate message for each question displayed. This would be more involved, but would tell the student which questions were correct and incorrect.
