This book of Norman Lewis makes easy to understand the root of the word. One time when you understand the meaning of root word you will easily accessible to all the meanings derived from that root word. I still reads this book and I had this book last year. In the last of this book, it has a section of Word and Meanings and I think this section is very important for the competitive examinations. After the reading of whole book this section become easy to understand. If you want to increase your vocabulary then I will suggest you to read this book.
Thanks,
Jai Hind Vande Matram.