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.
I bought this book after to listening to a podcast about focus, I myself was struggling to focus on the most basic tasks in work. I've implemented changes that the author does in the book and they have made a massive difference to my life, this is the first book in months I've actually been able to finish. It was engaging from start to finish, well worth the read.