I agree with this. When our DD was going through this process, she was the first graduating class of our new school. The school had to be assigned this code as the students starting testing for the ACT/SAT.Sounds like it is asking for the school code associated with his h.s. I would have him ask his h.s. guidance counselor. Every h.s. should have a unique code that applicants input when taking the ACT/SAT tests.