I think MA is one of the only states that requires a person to get a License to teach horseback riding.
I took the test many years ago, but I believe it has been revamped in the past few years. The questions on the test when I took it were outdated and somewhat bizarre. It was also odd that they bunched us in with the people taking the MA Pesticide Applicators test.
I haven’t seen the newer test, but you should know both English and Western tack, the Mass. General Laws pertaining to horses, basics about feed, conformation, illnesses, all the basic stuff you should know. Honestly, I think the Commonwealth started it as a revenue generator, but in the past few years, there has been an effort to improve the test.