Flagging Quiz/Exam Questions
The 'Flag question' feature allows you to mark specific quiz or exam questions so that you may easily reference them once your attempt is complete. Some students flag questions to alert their instructor of any possible issues or confusion they experienced with that specific question. Flagging a question will not allow you to go back and change your selected answer.
By default, the quizzes in most courses do not allow students to skip questions and return to them later.