I have had feedback that one of my quizes was crashing. In testing, it behaved strange - not clering the answers then not entering the answers, but it worked eventually.
How can I prevent the quiz crashing in future as the feedback was publicly negative? I have removed the quiz for now.
Please refer : https://wplms.io/support/knowledge-base/auto-evaluate-quiz-not-working/
Also check your question settings as per : https://wordpress.org/support/topic/creating-quiz-from-front-end