Yet they don't disclose the data.... for 3 years.... that says everything......
Didn't you just claimed:"The fact that china did not allow other regions to take part but only shanghai was selected tells everything... "? The fact that even the poorest provinces scored about the same as oecd average says a great deal about China's educational system, disclosure or no disclosure.
Further reading on the Shanghai score,
educationtoday: Are the Chinese cheating in PISA or are we cheating ourselves?
An excerpt:
Short of arguments about methodology, some people turn to dismissing Shanghai’s strong performance by saying that Shanghai’s students are only good on the kind of tasks that are easy to teach and easy to test, and that those things are losing in relevance because they are also the kind of things that are easy to digitise, automate and outsource. But while the latter is true, the former is not. Consider this: Only 2% of American 15-year-olds and 3% of European ones reach the highest level of math performance in PISA, demonstrating that they can conceptualise, generalise and use math based on their investigations and apply their knowledge in novel contexts. In Shanghai it is over 30%. Educators in Shanghai have simply understood that the world economy will pay an ever-rising premium on excellence and no longer value people for what they know, but for what they can do with what they know.
PISA didn't just test what 15-year-olds know in mathematics, it also asked them what they believe makes them succeed. In many countries, students were quick to blame everyone but themselves: More than three-quarters of the students in France, an average performer on the PISA test, said the course material was simply too hard, two-thirds said the teacher did not get students interested in the material, and half said their teacher did not explain the concepts well or they were just unlucky. The results are very different for Shanghai. Students there believe they will succeed if they try hard and they trust their teachers to help them succeed. That tells us a lot about school education. And guess which of these two countries keeps improving and which is not? The fact that students in some countries consistently believe that achievement is mainly a product of hard work, rather than inherited intelligence, suggests that education and its social context can make a difference in instilling the values that foster success in education.
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