Navigate back and forth in a quiz

Hi,

I got an eLearning that ends with a quiz. For each question you must click a Submit button to proceed to next question. My prev and next buttons (own graphics) are disabled not to be able to go forward or backward in the quiz.

If I would like to change so that you can move forward and backward through the questions, let's say you are unsure about any question, what do I do? I do not want to have already filled in answers to disappear if one chooses to go back among the questions.

Thanks!

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