Remarkable how you jumped from 'IQ is largely genetic' to 'Turkish children remain at the same poor level that their parents achieved in the tests'.

Don't you see your the mistake in your reasoning there?

Probably that too can be explained by genetics or maybe by a failing education system but the point is: there are very dumb Germans and very smart Turkish people who would still score different on an IQ test in German. Especially after going through the German school system (which of course would never discriminate against children with a different ethnic background /s) and so on. The confounding factors at play here make the whole comparison without accounting for those factors utterly meaningless.

Germans have an average IQ of around 100 (it used to be 105 before immigration). Turks have an IQ of 85-90. If you are not biased, you can clearly see these differences in everyday life. With a few exceptions, the intellectual achievements of fellow citizens of Turkish origin tend to be rather low. The situation is different when you look at migrants from high-IQ countries, such as China (who have an IQ of 104). These children often achieve amazing results, for example in the International Science Olympiads. The US is actually only able to achieve top places in the Math Olympiad thanks to Chinese migrants. Almost the entire US team consists of people with a Chinese background. Look at this picture of the US-Team for 2023 if you want to know, what I mean: https://maa.org/wp-content/uploads/2024/05/Screen-Shot-2024-...