This book is helpfully reassuring if you're a bit nervous about taking such tests.
The general comments do give answers to niggling questions about how to cope with the tests.
The example tests are useful, though they're only indicative - for a fuller practice, try the online practice tests on SHL's website. I would say that many of the example questions in the book are more straightforward than you might want to expect in the "real thing".
What really worries me, though, is that the answers given in the book are sometimes wrong. It's not clear whether this is just an editing issue or whether the database they're taken from is wrong. In either case, it should be cleared up. If the database is wrong, then that is shocking, because peoples' job applications may depend on this. The book states "psychologists are only human" by way of apologising for errors that do crop up. However, as someone who has set professional exam questions, I view this as unacceptable.