"The Ultimate IQ Test Book" is a collection of 25 IQ tests (mostly drawn from "The Times Book of IQ Tests" books 1, 3 and 5 - no idea what was wrong with the tests in books 2 and 4). The questions in this book are culturally unbiased (unlike those in some other IQ test books that I have seen) and cover the three main areas of intelligence that are typically covered by IQ tests, that is, verbal intelligence, numerical intelligence and spatial/visual intelligence. However, the word "ultimate" in the title is a bit of an overstatement.
The biggest drawback about this book is that the tests are unstandardized. What this means is that you can get a score for each of the tests in this book and you are told whether you are average, excellent, exceptional, etc, based on this. However, it is not possible to convert these scores to IQ values. Furthermore, the questions in this book are slightly different from those that are typically found in most standard IQ tests. Mensa's website recommends the books of H.J. Eysenck, for those wishing to practice for their entry exam, and the questions in this book are quite different from Eysenck's questions. Also, the solutions to the questions are not always well explained. There are several questions in this book that I still can't solve, even with the answers.
This book is a reasonable puzzle book and may provide some assistance to those intending to sit an IQ test in the future, but only if you're run out of other practice problems. For people actually wishing to calculate their IQ, then this is not the book for you. A more suitable book is Test Your IQ. "Test Your IQ" is not a perfect book either, but at least it allows you to get a numerical value for your IQ, rather than simply telling you that you are "exceptional".