To get hired, you need to pass the Postal Battery Exam 473. You will take it at an independent testing facility in your area. The higher your score, the sooner you can be hired.
Before you take this official exam, you need to prepare for it. Practice exams are available for you, at this site, in the “Postal Exam Simulator.” The Simulator is available exclusively to those like you who have registered at this site.
There are several complete practice exams available for you to take. Taking these will give you an advantage in getting hired.