There are several ways, 1, search Baidu's post bar and see if there are any in your school, my primary school, middle school and technical school. If you don't build one yourself, maybe your classmates will call you back when they see it. 2. Search Baidu's or Google's web pages. The keywords can be XX school, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate, XX classmate and XX classmate. As long as you write down the characteristics, it will help you search. Everyone can have a look online. Many people have this 5. If you have the ability, you can go to the archives to find out. There will basically be files of your classmates. 6. Check whether there is a QQ group in your school on QQ.
Finally, I wish you find your classmate soon _