When you register for your ACT, you have to submit codes for your high school and test center, the location where you're going to take your ACT. The codes make it easier for ACT to keep track of the high school and test center of everyone who takes the exam. If you enter the wrong high school code, your school may not get your score report. If you select the wrong test center, you may not be able to take the ACT at your preferred test center location.
In this article, I'll let you know how to look up ACT high school and test center codes and advise you how to use them properly.