Each state has licensing procedures for lawyers, doctors, teachers, contractors, engineers, etc.
As a California real estate broker, I have learned that our historical licensing practices, and legal system, are leaders in this country.
Some states use onerous licensing requirements to limit entry. California uses it to insure competence.
One lawyer friend of mine, loved his wife dearly, but she failed multiple times to pass the California Bar Exam.
So she assisted him.
My wife had a friend, who failed the real estate exam multiple times. To hear her talk, she sounded pretty bright.
Some people simply aren't cut out for exams.
Hastings-Bezerkeley is a top flight school. If their people pass at just 62%, the exam is REALLY HARD.