Agreed. Back when I went to high school and college, we had teachers that taught (some). Have you seen the Common Bore math curriculum? I am a computer developer by trade, and as intelligent as I am, I had a hard time following how they did simple addition and subtraction. They took a simple problem and made it insanely complicated. I feel this was on purpose, the end goal being the removal of America as a technology leader.
Just so.
I had a more jolting experience in my own school days. My primary school to 4th grade was a Calvert System private school for Americans in Istanbul in the early 50s. Back in America in public school, the system partially caught up to that finally sometime in high school and I go more history in Istanbul than I got in school in the USA through 12th grade. I also got extensive Geography and French and my arithmetic carried my right up to Algebra before PS taught me anything new.