The second link [2] is very interesting - it breaks down some past USA results by ethnicity. It also seems the underlying PISA data is a closely guarded secret

The second link [2] is very interesting - it breaks down some past USA results by ethnicity. It also seems the underlying PISA data is a closely guarded secret. No doubt a political tinderbox. > Why does my second graph have to compare reading scores from 2009 to science scores from 2006 and math scores from 2003?