 If you liked
IS: Infinite Stratos
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 ...then you might like
Saijaku Muhai no Bahamut
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Both have girls who control mecha and there always a male protagonist that can also pilot one and being the join in a all girl school academy and being the only male attending.
Both are very similar by just those but different in their own right if you like one you might like the other
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Recommended by AkatsukiUlquiora