Does the subject want to ask "what should I do if I fail the closed-book exam of the National Open University"? Take the final exam next semester. According to official website, who inquired about the National Open University, the school exams are divided into open-book exams and closed-book exams, computer exams and semi-open-book exams. Those who fail the closed-book exam can take the final exam next semester to pass the individual final exam.