I got the All-In-One Security+ guide by Gregory White, and Wm. Arthur Conklin.
Amazon.com: CompTIA Security+ All-in-One Exam Guide, Second Edition (Exam SY0-201) (9780071601276): Gregory White, Wm. Arthur Conklin, Dwayne Williams, Roger Davis, Chuck Cothren: Books
Looking at the reviews I thought it should be good enough...
Honestly I don't know the backgrounds of the authors, but the book is written academia-style, very dry and very boring.

(My uptight computation theory professor in college loves that sorta thing.) More of an educational textbook than an exam guide.
Compared to another certification book I used, absence of an important element is alarming. This book is missing the copy of Security+ objectives with chapter numbers where to look the objective up.
The book started out with written out history of security legislation including issues with DRM. As I am short on time, it worries me that I'm wasting time on something that will possibly never be asked on the exam. Is it important to know the names of these legislations and other history?

If anyone used this book please tell me what I can skip.
Also I'd appreciate if someone suggests a good strategy for about ~20 hours study time.

:
Network+ is still fresh in my mind as I've just taken it this week, so I probably don't need to go over it too much, like the OSI model.
Also, please don't tell me to get Darryl Gibson's book as my exam is in 2 days.

Help is much appreciated!