To calculate the overall star rating and percentage breakdown by star, we don’t 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.
the book was received with the binding stuck in reverse. although once you open the book it was pefectly printed inside but the cover was in reverse. disappointed with amazon on that. i ordered 3 books out of which only 1 had this issue. so rating it 1 star. since it was a gift for my nephew (who stays in a diff country) i cant return it to amazon.