I suspect that perhaps you are not a teacher, and have never applied for teaching work. Or maybe you live somewhere where school hiring practices are very irresponsible.

My daughter is a teacher who has just changed jobs. The process was something like this:

* Apply (CV, plus extensive covering letter)

* Prospective new head knows old head (they all know one another) so they talk

* Candidate gets an interview, and has to prepare a class

* Interview day: candidate delivers prepared class, observed by head and head-of-year

* Candidate is interviewed at length by a panel of three teachers, including head

* Decision made subject to references

* References taken up; award position

What you've described is a process that isn't even appropriate for a supermarket checkout clerk.