The way to convince people
that education is getting better
is to restrict education to what can be tested,
train teachers (or force them) to teach to the test, and hey presto the results go up!
But if all that's being taught
is that which can be tested,
is it getting better?
If education is leaving out more and more stuff that teachers, students and society thinks
is valuable,
then no matter how good the results,
education isn't getting better is it?