Testing Students On Important Facts

Teachers ought to "teach the test."

Why?

Because the test subjects ought to be those which are critically important to know.  Rather than the students guessing which subjects are going to be tested - and generally discovering lots of insignificant facts, which have no relevance to real-world application - educational specialists ought to decide which elements of any course of instruction need to be learned.

Then the instructors can tell the students, "You need to know this.  This is why you need to know it.  You can expect to see this on the test."

If the students learn it for the test, so what?  The objective has been reached.  The students have learned an important piece of information.

Mission accomplished.