"She is good in math" is a perfectly acceptable, but perhaps informal. (Do not capitalize "math") As for "She is good in English"--the question is what do you want to say. Do you want to say that her linguistic command of English is good?
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faisalkhan I knew that the sentence "she is good in Math" was right but suddenly found that I was wrong.What about English? Can I say "she is good in English? "ThanksYou haven't explained why you found "She is good in math" is wrong.