Log on to the Illinois State Board of Education Student Information System (see Resources).
Find your Region County District Type Schools (RCDTS) number. You can find it at the RCTDS Lookup (see Resources).
Enter your RCTDS code to mark your location as a student's testing school for eligible students before Jan. 9 of any given academic year. Your testing materials will be mailed to you at the proper time.
Call the Illinois State Board of Education at 217-782-4823 if you weren't able to register before the deadline and you still wish to administer the ISAT. Ask to speak to a member of the Student Assessment Division.