What is the corner cutting line on the answer sheet for?

This cutting line is to make the answer sheet less neat, so that the staff who receive the answer sheet can put it in the correct position quickly and conveniently. If it is a complete rectangle, the staff may put it in the wrong place because they are in a hurry or in a hurry, so that the card can't read the results, which will have a very bad influence on the students. Therefore, even for the convenience and efficiency of the staff, it is also for the sake of students. In this case, a broken foot will usually be made next to the record card.