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.
Contains a lot of information. If you have this book in your possession then you don't need to buy any other reference book. It has a lot of questions which help you memorize. It has extra content which helpa you engage yourself more in Biology. I absolutely loved this book and the exercises. It is written by a different author which makes it the best. The exercises are amazing. It has practical based questions,Quiz, assesments, value based, real life sitjation based, cbse questions from sample paper.