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.
One can invest in this book for their child even if the child isn't studying in an international school. The book has colorful pages of great quality which automatically make learning interesting for a child! Topics are simple to understand and are well-written. The book is worth the price and Amazon sells it a decent discount! No answers are mentioned in the book, however the answers are available online.