If your graduate students and undergraduate students are not in the same school and college, then they can't be used, because the stamp and signature on it are all the information of your school and college when you were an undergraduate.

if you are all in the same place, and there is no date on the tripartite agreement, and you don't have your personal information at that time, you can still use it to deal with some enterprises that you are hesitant about (bracket laughs).