to be quite honest, teaching in this age of accountablity makes it a little more strainious on a teacher. As an pricipal, they are going to hire a FULL licenced teacher over a interm position, esp if its gym bc there are thousands of them. I understand the paying part, I was a college student who had no money played football and paid for the test and worked part time. They are not 50-50 shots. If you study, and many study programs are online free, you can pass. They are $90 to take them and can be scheduled 4 months in advance. Thats plenty of time to study.
also just a hint, even if its true or not, you are getting paid to teach, You should stress the intrest to be a teacher/football coach, and not a coach/ teacher. Principals want people who are going to reflect their core grades as the best they can.
just FYI.