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Hello,
I'm not sure if I should use the word "in" or "at" in the following sentence, or if both ways are grammatically correct?
I love school because I'm a wizard "in / at" every subject.

I'd say 'at', which mirrors 'good at'. The 'in' is probably less common, but really doesn't affect the meaning much. A treatise on prepositions might start going on about how the 'in' sounds more literally like you are a wizard in whatever, while the 'at' adds a less literal nuance, stuff like that (cf. I'm a black belt in karate; ?I'm a black belt at karate).

Hello,
thank you very much for taking the time to answer my questions.