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it's like that here in the US too, basically impossible to not move up through the grade levels from K-12.
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I had no idea, kinda shocking to me, honestly.
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imo it's one of the biggest problems with our education system. People get moved up a grade regardless of their learning. By the time they get to high school / college, the differences in ability can be vast. In my college classrooms, I have simultaneously kids who know calculus quite well, and others with a 5th grade level of math.
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