Identify the collective noun in the sentence: "Students have to take their entire school books home on the last day of school."
I couldn't find any credible sources stating that "school" is a collective noun or otherwise (although The Free Dictionary seems to say so).
So, in the given sentence, is "school" a collective noun? If not, what is?
EDIT: The sentence is from my grammar book, and not something I invented. Bad book I guess.