>I have never heard anybody say publicly “reading this too hard for me”. For the non-math subjects, some people do say "I'm bad at spelling", or "I'm bad at gr

>I have never heard anybody say publicly “reading this too hard for me”. For the non-math subjects, some people do say "I'm bad at spelling", or "I'm bad at grammar". At a higher level of language skills, some people say "I'm bad at writing speeches or wordsmithing an email/Powerpoint to explain things". Personally, I've always been weak at grammar. Intellectually, I know the difference between "whom" and "who" but I inevitably forget the extra "m" in the appropriate spots. It's not a matter of insufficient practice either. I've been practicing English for decades since I was in diapers! On the other hand, I never forget the minus sign for the derivative of "cosine(x)" being "-sin(x)".