To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Most probably a pirated version The print quality is poor, text is blurred, Cover is of below par quality. 20 pages into the book, I found typing errors. My suggestion is to avoid this book, go for some other publication.
The quality of the book is not great, it seems like a pirated version of the original copy. I would not like to order books just because they are cheap on Amazon but also keeping in mind they are original prints.