My Midwest school does, but it's usually rated as one of the better ones in the state.

Someone up thread seemed to think the average student of another country would blow away the average US student. I don't think this is true. The US pays lip service to universal education more then most other countries. Unfortunately we don't follow through on it and this leaves a large enough number of substandard schools to make a significant impact on US test averages. The sad fact is the tail end of these averages are so bad they bring down the score, but the "average" for the majority of US students is much higher.

This stratification of education is probably a significant contributor to the stratification of wealth in the US, and it's not OK.

Wait ! Private schools in the US cost $30k a year ?!

I am assuming you are talking about K12 education. That is pretty absurd.

I also live in California and I also send my child to a private school which costs upwards of 30k.

California currently spends about 10k per student for public education. That makes 30k sound crazy, but in 1970 California spent 5500 which is about 35k in 2017 dollars. California (and most of the US) is woefully underfunding it's schools.

Public schools also cost about $20k/year/pupil (I wrote $30 before but looks like I was mistaken). But this is paid from general budget so nobody cares too much, because tax money obviously aren't real money.

Cato claims these figures are grossly under-estimated though [1] and the real costs may be twice as much.

[1] https://www.cato.org/publications/policy-analysis/they-spend...

Yes the schools themselves have a high variance distribution in what they are like and who they seek to serve.