You can't. If this course is optional and you fail in the end, you can just take another course next semester to make up the credits. If you fail a required course, you need to study this subject again next semester. Therefore, the continuing education of Wenzhou's school name forgot to take the exam after class, so it was impossible to re-take the exam. Continuing education is an educational activity for all members of society, especially adults, after school education, and it is an important part of lifelong learning system.