To calculate the overall star rating and percentage breakdown by star, we do not 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.
The books are great, with lots of info and clean layout for helpful learning but it arrived damages on the corners. Especially damage on the Science book, with small cuts on the cover edge, so I am not happy about that.
Everything about this book is awesome except the one thing it needs: AN INDEX. For. crying. out. loud. You can't just flip to the back and find a topic, you have to go to the table of contents, look for the subject you're topic is under, then leaf through the pages until you find what you are looking for. It's faster to Google it.
As a middle school science teacher, I can definitely tell you there are some core components of math missing in this book. It was useful as a supplemental guide, but it definitely didn't help me in all units.