# data[].attributes.headline
Elaborate on what you mean by the size of the class. Do you mean # of students or the physical space?

# data[].attributes.subject
Elaborate on what you mean by the size of the class. Do you mean # of students or the physical space?

# data[].attributes.body
Is that mean the powerpoint slides (PPS) with th instruction?
That will not change the size of class. :)