Once signed, there are corresponding benefits, so you can't sign it indiscriminately. Once an accident involves a dispute of interest, the signatory bears the brunt. And the admission notice is equivalent to a letter of introduction. It can only be signed by the relevant person in charge of junior college and undergraduate school.

If you sign on behalf of the parties, you must obtain the consent of the parties, otherwise it will be infringement, which may seriously involve breaking the law.