 If you liked
Ansatsu Kyoushitsu
|
 ...then you might like
5-toubun no Hanayome
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Both have in common a teacher/tutor whose main aim is to turn bad students into excellent students, while being caring about them and looking for different perspectives and approaches for each learner.
Other than that, and the fact they are both school anime, they are fairly different, Gotoubun is more of a Harem romcom, while Ansatsu Kyoushitsu is a Shounen.