The latest global school tests reveal shocking new declines. EVERY THREE years the OECD, a club mostly of rich countries, releases the results of international school tests sat by 15-year-olds all across the world. There were reasons to hope that the latest data, published on September 8th, would bring positive news. Marks in mathematics, reading and science had collapsed in the previous round of testing, which was carried out just after the pandemic. Policymakers dared hope that, with the calamity well in the past, grades might start to rebound.

