The sense of an exam is that you will have the chance to show that you know more than the experts.
That you are able to discuss a question and not searching the one only correct answer, to demonstrate that you have the competence to break rules and argue why your point is also possible and defend it. Books are often written by a follower or disciples of a certain theory in the style of a catechism.
I agree with Michael Curtis supporting especially the last sentence.
So you can surprise your experts when you ask: do you mean the rules of the Vienna epoque or Baroque, and if Haydn ... the early Haydn or the later? It‘s good to know the principles of different authors as you can better understand, learn and memorize the rules if you can compare them with each other’s. It‘s interesting to see how different authors came to different rules in different times. (Only with this position you can show that you know something and don‘t only repeat what you have read in books!)
The 2 pages are copied of the „Harmonielehre“ (de la Motte). He shows that the doubling of the third (basstone, first inversion) respectively the root tone of the triads of major chords in root position has changed and varied in the two Epoques and that applying the rules of the Classic-period to the music of Bach and Händel is absolutely wrong (German ed.) inaccurate (English ed.)