If the registration is completed, you should also fill in the student number. If it is not filled in, it may cause information errors.
The student number is the number of the student's identity, and the length of the student number is 16 digits. The meaning of each number is: province and city 2 digits+district and county 2 digits+school category 1 digit+school 3 digits+student category 1 digit+year 2 digits+class 2 digits+student number 2 digits+check digit 1 digit.