The next survey in 2015 was broadened to include four provinces and cities -- Shanghai, Beijing, Jiangsu and Guangdong. China still performed well that year , but its scores were down across the board compared to the previous survey, when only Shanghai students were surveyed. Not a competitionA record 600,000 students across 79 different countries and territories sat the 2-hour PISA test last year, the OECD said. core The survey also warned of some troubling trends shown by thecore 36 OECD countries. But most of the countries saw virtually no improvement in the performance of their students since PISA was first conducted in 2000.

Source: CNN December 03, 2019 10:18 UTC