Here is what I wrote.
“From decades of observation – as a math professor – I can shed light on a fair amount of the problem.
Poor high school education starts in college, not high school. In a nutshell, here is what happens. (Actual cases, and more explanation are on my blog inside-higher-ed . There is also a suggestion for change.)
A highly regarded (though not highly scrupulous) professor gets a multimillion dollar grant to produce PhD’s in an area of “national need” – like say, math, where there is pressure for more native English speakers to teach in college. That professor pumps out PhD’s – many of which are not qualified.
Many of those PhD’s go on to teach at a regional college. Most don’t do this well – for many reasons. So, of course their students don’t learn. Some of these students go on to teach in high school, though they don’t have an understanding of their subject – usually no fault of their own. And then there we are – sending a lot of uneducated high school grads out in the world.”