TL;DR: The writer, a math teacher, is quitting (edit: his) job because of increased bureaucracy and standardized tests. Mostly, it seems, standardized tests. The problem is, math is the subject which is BEST served by standardized tests. There is really no fuzzy aspect to K-12 math: answers are right or wrong. And there are of course many benefits to standardized testing like teacher and school evaluation, providing…
The point of a math class isn't so you can get correct answers on the test next month. It's so that for the rest of your life you have a reasonably mathematical intuition and decent math skills.
We all know people who crammed for quizzes, did ok, and forgot everything. That was a double waste; not only did they learn nothing, but they were trained to treat mathematics as hostile territory. Standardized tests reward the same sort of shallow behavior.
That's ok when there's no particular incentive to do well or poorly on the standardized test. But now that jobs and funding and careers are riding on the results, there's every reason to be suspicious of the results, and worried about a negative effect on people actually learning anything lasting.