basically just for scaling purposes.. i had some pretty bad science teachers in junior years so i missed a lot of the basics and after years of not liking science it makes it difficult to enjoy it now.
We were told that any of the texts in the booklet can be referred to specifically in the final exam and that a basic understanding of each is recommended while an in depth analysis is required of 2-3 so that you can reference the one that most relates to the specific question.