Test results also show significant decline in the US: https://www.brookings.edu/articles/the-pandemic-has-had-deva...
My wife and I had just started sending our daughters to public schools when the pandemic hit (kindergarten and pre-k). We were excited about some of the special programs available in our school district. But the public schools handled the pandemic so much worse than many of the private schools, some of which stayed in-person throughout the pandemic, sending students home in clusters of just 6 to 12 when someone got sick... when nearby public school districts were closing down entire districts at a time on the strength of a single student's illness. We moved our girls to a private school that stayed in-person, and I don't think we're coming back anytime soon. We're pretty happy where we are, and I expect that public schools will need to spend significant resources managing their social and academic pandemic fallout, leaving less time for students who have not (yet) fallen behind.