An FYI for those unfamiliar with PSI.
PSI is an examination administering service. They do not write the exams but they do all the logistics and report back to the state/AHJ/whoever hired them. You could be sitting there taking the electrical masters test while the guy next to you is taking the journeyman blasters test from another state. They also offer computerized or paper tests as well as instant results. Virginia has been using them for almost every tradesman test for several years. The system works well.
