Examination signatures are mainly used to compare the handwriting of candidates, because different people have different writing habits. It is difficult for two people to have exactly the same writing habits if they don't imitate them deliberately.

Therefore, the signature of candidates can actually be used as an auxiliary means to prevent cheating, and administrators can roughly judge whether candidates are suspected of cheating by comparing the signature patterns of candidates in each exam. If the signature handwriting is too different, there may be suspicion that candidates will change their exams.