Amazon.com: Customer reviews: The No-BS Guide to English Vocabulary and Effective Communication: An Interactive Road-Map to Learning Words, Fixing Spellings, and Building Fluent Pronunciation Skills Forever
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 analyzes reviews to verify trustworthiness.
This book has done an excellent job building a path for someone from novice to a proficient in the language. An understanding words and their expressions are the fundamental premises of learning a language, at the same time it helps you get familiar with basic nuances of the native speaker and I feel this book has struck the balance of both. It's a great addition for anyone wants to improve their language skills.