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I'm doing a CISSP course at the moment and this book, originally by the late Shon Harris is very good. The bundle comes with practice tests, and you should look to lock yourself away for 3 hours each time you do one of these... according to my trainer, 80-85% on the practice tests , consistently means you are likely to be 'exam ready' which is important since the exam costs $700.
I bought other CISSP books too, for completeness, and because the cert needs renewing every 3 years.
This one was recommended to me by a friend and long-time CISO - it is what he used to pass.
This is an excellent resource for the CISSP, very effective materials and presented in a impactful way. The book is very detailed but readable, the tests and online materials are very well done. I've used a bunch of options in my studying and this is the best so far.