Non-Fictional VS. Fictional books for SAT

<p>Hello.
To imrpove SAT CR score, I know that I jave to read many books.
I like to read non-fictional books (Science & History) and favor them more than fictional ones. Is it really needed to read fictional books, especially medieval classics, to improve SAT CR scores? If I read 100 books, 95% of books that I read are always non-fictional books...is this a problem or it is okay?</p>