Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
this book was fine did not find it special. very less stories defective detectives was the worst trecking was very nice loved it and even suppandi pest control was amazing i like almost all suppandi books they are so funny. i found training book very bad. it was boring can make better books.not very helpful