This is the answer. Many (all?) European schools don’t give homework (this is partly because of the way the grad programs work). It’s on the students to study in order to pass the (difficult) exams.
Seems this did effectively abolish homework if AI is now doing it all for them. The result seems to be that fewer students pass the exams, not more.
As with any skill, practice is necessary to achieve competence. If homework is no longer a viable way to force students to practice, you'll need to find some replacement, you can't just abolish it and expect there to be no negative consequences.
I don't think this is true, and frankly, I don't care what they do in Europe.
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There is no such thing as a European school. Each country is different. And if the country is a federation, each state might be different. And we have homework in most European countries I’m aware of.
What are you basing that claim on?