This is a book for native English speakers. It's quite old. Its methodology and content are unsuitable for non-native speakers of English. In your case, a native speaker would know from exposure to different accents what sounds the writer means when he writes "cawfee". But you would never explain this issue in this way to a non-native speaker. This book will probably confuse you a lot.

Recently I bought a book which is called "Word power made easy", but i don't know how to use it properly/correctly. What's more, I don't understand its annotation for word pronunciation. For example，coffee-------KAW'fee . So I don't know how to pronounce the words correctly and how to spell them. (He is such a mark in China , coffee-------/ˈkɒf.i/. --> I don't understand what you want to express here). I really want to use this book properly. I hope you could give me some advice.Thanks.