It is a really good book for you study English. In this book you can study how to speak English and many grammatical points of English language which are very important.
This book is more than 40 mb, so it may take you a little long time to download. And the book is also designed for self-study. You can learn by yourself without any teachers to guide you because the book will be a teacher for you.
If you want to work in Korea and want to have some advantages over others, it is a good idea that you learn some basic Korean speaking phrases. Korea is a favorable country for Myanmar people to go to study or work because there are many people there already working and studying.