good in / at

[Lenka]

I've been taught (shall I use this tense here?) that "good" collocates with "at" => to be good at sth.

However, I today, I have read in a textbook of mine that it's also possible to say "good in" in case we're speaking about some classes at school.
e.g. She's good in Music. (in the Music class at school)

Are there any other "exceptions" when we shall use "good IN" instead of "AT"?

[Philly]

Hi Lenka
.
For example:
He's good in an emergency because he's good at CPR.

[Humble]

Hi, Lenka,
I think I’ve read somewhere on BBC English that when talking abt classes, you can use in:
Peter is the strongest in his class in physics.
Otherewise it’s at:
Nancy is very good at making everybody do what she wants.
Cheers

[BobK]

Originally Posted by Lenka

I've been taught (shall I use this tense here?) that "good" collocates with "at" => to be good at sth.
...

Yes, you should - but you should use the word should here . And that collocation rule is good, with the exceptions Philly and Humble have noted. There's another exception, but this is rather informal and very idiomatic:

After I'd explained, she was very good about it - she didn't seem at all angry.

But this is nothing to do with proficiency, so I guess it's not really relevant.

b

[Lenka]

Thank you all!

Originally Posted by Philly

Hi Lenka
.
For example:
He's good in an emergency because he's good at CPR.

Thanks for the example, Philly. To tell the truth, if somebody told me to "guess" which preposition should be used there (good in an emergency), I'd probably answer "at". It's just fixed in my mind and it is a new thing for me, that you can also say "good IN". I must get used to it.