Full disclosure, I have no idea what computational sorcery you are doing here, but PISA cheating in Asia happens on a different level. Nations decide themselves how a representative selection of students is picked. China, for instance, picks students from elite areas of the country, and then from the best schools within that area.
Rural Chinese areas have very poor school performance. In 2010, 2/3 of Chinese children lived in rural areas (note 2/3 of the total population lived in urban areas).
PISA scores seem easy to hack, and seemingly are. Let me know if you want sources.
Full disclosure, I have no idea what computational sorcery you are doing here, but PISA cheating in Asia happens on a different level. Nations decide themselves how a representative selection of students is picked. China, for instance, picks students from elite areas of the country, and then from the best schools within that area.
Rural Chinese areas have very poor school performance. In 2010, 2/3 of Chinese children lived in rural areas (note 2/3 of the total population lived in urban areas).
PISA scores seem easy to hack, and seemingly are. Let me know if you want sources.