This book is not as good as the Cambridge collection. I think the answer key has a few mistakes, and it gives only one option for answers that would have more than one option. Plus, some answers have two words or more, when the questions asked for one word only. This is fundamental in the IELTS test, so this type of problems in this book can mislead first-time IELTS test takers.
One more thing: the format is not 100% like the real test. For example, in some exercises, section 4 in the listening section is broken into two moments, so you have a pause to read the first few sentences, answer to them and, then, you read and answer the remaining questions. The real test asks you to read all the 10 questions at once and start answering. There's no break.
Having said that, this book can be helpful if you're confident about your skills to notice these problems and if you don't find the Cambridge books available when you need them. Hope that helps.
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