I would love it if that were so simple. But I'll see if I can explain in a simplified way.

The data format would be something like

Class A ....... Student 1
Class A ....... Student 2
etc., etc. until
Class A ....... Student 100 (so, obviously more students in Class A than will fit on one page)

Class B ....... Student 1
Class B ....... Student 2
etc., etc.
Class B ....... Student 50

Class C ....... Student 1
Class C ....... Student 2

and so on.

In the black header, I have information about Class A. The same information must be repeated at the top of every page that includes students in Class A (100 students / 20 students per page = 5 pages). Then there will be a page break, and Class B will start with a header containing information about Class B. And so on.

Sorry, it was not possible to convey that in a single image.

If this can be done without grouping, that would be fantastic.