An alternate view on the PISA testing and how its affecting our
math education.

https://dianeravitch.net/2014/05/08...eicher-of-oecd-against-too-much-testing/

K-12 Math Education has been a mess since the new NCTM standards came out in 1989. The fight between inquiry based / constructivist math curriculum and more traditional ones has been raging ever since.