Google Classroom Access

I have created a Google Classroom to upload upcoming lessons. For access to our classes Google Classroom, first students must log in using their district username with and their district password. The configuration for student username and passwords is as follows: 

1st 13 characters of last name with no special characters 1st 2 letters of first name and last 3 numbers of their student id. The password is 1st 2 letters of first name and entire student id with leading zero. See example below.

Linda Coolbaugh 012345

Username: coolbaughli345   password li012345

Then enter the classroom code: fes2nze