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It's a very tricky question and a lot of factors play in it to get on a conclusion.
Instead of this, one should ask, Does books are required for SSB preparations?
or, Can books solely help a student to clear SSB Interview?
I will present my personal view on this, it may differ from person to person.
No, Books are not sufficient and neither required for ssb preparations. This is for two reasons, Firstly, books are commercialized product and mostly written by persons who didnt had cleared SSB with a reputed author name, there is very less learning value in it and only confuse a student then help him in preparations.
And secondly because of the complex examination pattern of SSB, its various component needs personal guidance and one to one guidance/coaching for even slight improvement in student skill.
All the info provided in a.ny book are readily available online and should be better explored and utilised than buying a book.