This book is a nice secondary addition to the primary materials that you alreadly likely have in place. That being said, I found this book to be extremely helpful to examine the various real estate principles one will face on the actual California real estate exam.
Often, I think many California realty students get too bogged down with materials generated by only one education company, professor, live lecture of video series, etc... and they forget that the California realtors examination covers a multitude of topics from many different angles.
I highly recommend that you buy and use this book as a direct and positive supplement to the core materials and/or educational sources that you've already been using while prepping for your California real estate exam.
Of particular value, if nothing else, in this book, is the Hot Tips/Hot Topics section of the book in which the authors have pleasantly reduced hundreds of nitbits regarding California law into exhaustive and easy to understand one-sentence blurbs. I found that cramming and/or memorizing these hot-tips on the last few nights before my actual exams were critical to my securing a passing grade.
Like other guidebooks, it comes with reams of practice questions, many that you've likely seen before--but as we all know, the secret to passing the California exam is practice, practice, practice. Buy this book. You wont regret it.