[Magg]

Hello,

I always teach my students to write the school subjects in capital letters.
In spite of the fact that most couse books present them like this, I´ve come across examples where capital letters are not used.
Even children say to me that their teacher doesn´t pay much attention to the matter.

Must school subjects be written in capital letters or not?
What do grammatical rules say about that?

Thanks in advance,
Magg