 If you liked
Mahouka Koukou no Rettousei: Nyuugaku-hen
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 ...then you might like
Ultimate Antihero
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Both stories have a MC who is more powerful than he appears.Ultimate Antihero has an MC who's true power is supposedly sealed away while The Irregular at magic High-Enrollment Arc has an MC who's real power cannot be measured using standard means,thus gets classified as weak.