question about GA state exam application

I will graduate during December. After reading the application form, I think my nursing school only needs to sign one page for me. Then I need to get an official transcript from the school and mail the application form, transcript and fee out together, am I right? I wish to take the exam right after I graduate. But today our school told us they need some time to send out a letter to every state board saying XXX is a student who has finished the program and has graduated. My question is that is that a requirement for GA state? I think the page signed by the school actually saying the same thing. Why do the school need to send a separate letter to the state board again?