Go to 'Exam Management' > Click on edit button of the exam you want to re-open > Select new 'Exam Start On' and 'Exam End On' date and time > Click 'Update'
Cannot. The re-open exam only available for the students who miss the exam.
Go to Question Management > Click on the edit button of the question you want to view answer > Click on '2 Add Answer button' on the stepper on top > You can view/edit the answers of the question now
Go to Exam Result > Click the filter icon button beside the Exam Column Header > Select the an exam and click Filter > Click on the Percentage Column Header 2 times to sort by the Percentage Score in descending order(Highest score to Lowest score)