I went on the OBN site printed out the app and with NCLEX you can pay for it ahead of time. Pearsons will send you acknowledgement. The board app here in Ohio, can take up to 6 weeks for them to accept it. I rather do my 6 weeks while in school not after I graduate and I am ready to take the NCLEX. If you wait like one of the girls that I work with...She graduated May 5 and still hasn't taken her NCLEX.
My college pretty much handed us a paper then said they didn't have time to explain it. So I called some recent grads and asked them. They all said that they did it about 6 weeks before they graduated. One had her ATT number within 2 weeks and took the test the same week.
Good Luck with school!