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Movies like Battle of the Classes (2019)

As everyone knows, children make no difference between social classes, skin colors or religions. But then why does Corentin, Paul and Sofia's nine-year-old son, only have friends like him at Bagnolet's school? And when his friends all leave for a private school in Paris, his parents are frightened. From now on, Corentin is the only one in his class. But the only what?