0 1 Go back to school and ask the teacher.
Find a long-lost classmate and go back to school. If the teacher is still here, you can ask the teacher to check the phone number of the classmate's home. If the teacher is not at school, you can check the contact information of that classmate through other teachers.
Find it by post.
Find a classmate who has been separated for many years, or you can search the post bar of your school and leave a message in it to see if there is any reply from the original class, so you can find that classmate through other students.
03 find QQ group online
Looking for a long-lost classmate, you can also search the QQ group of your own school class or other classes in your school, gradually narrow the search scope, ask in the QQ group, and try to find that classmate.
Ask through related classmates.
If there are other classmates around you, you can ask them if they have any classmate records or contact information of other classmates, write down the contact information of each classmate, form a contact network, and finally find that classmate.