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"I am good at English." Or "I am good in English."

Fluent sounds better. But again...

"I am fluent at English." Or "I am fluent in English."

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When referring to a school subject we do say at

I am good at Geography

so you could say

I am good at English

If you are describing your capabilities in the language then fluent is probably better and then use in.

I am fluent in English, Spanish and German

We may well phrase it differently, when emphasising some particular aspect of language skills

I speak English fluently

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