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.
How can a competitive English grammar book carry mistakes when when it is meant for the students who are preparing for their respective exams? I suggest not to buy it. Please refer other books even though if they are expensive. Did not expect this from Arihant.