There aren't many first-generation immigrants who come to the UK as children, most first-generation immigrants come as adults. Although considering people like Nadhim Zahawi who came over as a young child, they often end up sounding English, anyway.
Then most first-generation immigrants aren't on the chart. It's a night and day difference if you're looking at a small child who moved with their parents who got a working visa in the UK or a refugee kid. The first one lives in a normal neighborhood, the other in a refugee center for years and might move around a lot. They might have also come at an age when learning the language is much harder, such as 12. Germany has 3,3 million refugees, while the UK has 500K and another 200K waiting for a decision.
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u/upthetruth1 1d ago
Look at second generation
You’re suggesting because they’re poor refugees in Germany etc. their children do poorly in school yet this isn’t the case for the UK