You have bought an excellent book on Conjugation of Verbs & Exercises with Regular and Irregular Verbs.
This book will help you to use regular and irregular verbs correctly in all their forms; the Present Tense, the Past Tense, and the Future Tense. You will learn how to converse correctly in everyday English and it will benefit you when you travel and have to speak English. It will help you in school, in your exams, and in your career.
This book offers International English that is spoken all over the world. Everybody will be able to understand you and you will be understood by everyone all over the world.
This book offers a very good basis for learning English. It is suitable for all age groups.