How is it called in English when a student say another student an answer as if
an actor is prompted
&
how does this action- when a students says loudly an answer to another or writes to another students an answer
thanks

Question

How is it called in English when a student say another student an answer as if
an actor is prompted 
&
how does this action- when a students says loudly an answer to another or writes to another students an answer
thanks

Answer

This sounds like the loud student is being 'obnoxious' (classic word) - there are, of course, slang terms that are more common these days. But I think that's better for another day! :)