 If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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 ...then you might like
Youkai Apartment no Yuuga na Nichijou
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While reading the synopsis they don't seem similar at all, these two are actually really similar.
> Lot of human observation in school life
> Problem solving, done by the main character
> Friendship
While one is lighthearted supernatural and cute, the other is more grim but I can't help but think they're very similar when it comes to school life. Both series involve the main characters trying to cope with unreasonable people while observing and learning how to deal with them.