 If you liked
GTO
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 ...then you might like
Worst Gaiden: Zetton-sensei
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Basically the same idea as GTO but as a spinoff from the Worst series. Zetton becomes a teacher only to find out that his job isn't to teach but to make his class of all male unruly delinquents drop out. Zetton knows the kind of kids who are in his class, he used to be one of them and instead of doing what the principle wants, he chooses to try and help his kids graduate instead. Much less ecchi content, bigger focus on gangs both juvenile and criminal.