American public schools ARE abysmal, but PISA comparisons are very misleading.
This is the only country that places (essentially) all 15 year olds in an academic track school.
If you compared white and East Asian honors track students with these other countries (which is the proper comparator group) we would score much higher.
More kids are going to college than ever. Many have to take remedial classes. The fact that colleges/universities even have remedial classes says it all.