You can check it in official website, your university. Generally, at this time, freshmen will provide the account number of the freshman group at the beginning of the semester, so that freshmen can join the freshman group and understand the situation of the school.
The advantages of joining the freshman group are to meet new students, establish contacts, understand the new school, prepare in advance, and be familiar with the new curriculum. Every school will have its own post bar. Parents and children can look for the official group number in the school post bar and learn more after joining the group. At the same time, I believe that children will often use social software after the college entrance examination, know many seniors and sisters in the same high school, and can also enter the new group through them. But be careful not to believe the invitation to join the group sent by text messages or telephone calls of unknown origin.