There is nothing to worry about. The invigilation is not very strict. If the teacher is better, the topic will be given thoroughly. Make-up exam and retake exam are two concepts. Make-up exams are generally 60 points, and schools are not crowded. But if you think that the lack of credits will affect the postgraduate entrance examination, you have to retake the exam. The invigilation of the retake exam should be strict. In fact, the strictness of invigilation does not depend entirely on your teacher. Some teachers are chatting in front, and some teachers are very strict. If it is reliable, come back and ask the teacher for a range or something, and have a look before the exam. No problem. Happy New Year to you!