The best international relation book is
International Relations (10th Edition)
by Joshua S. Goldstein (Author), Jon C. Pevehouse (Author)

ISBN-13: 978-0205059577 ISBN-10: 0205059570 Edition: 10th

The book is divided into two parts: International Security and International Political Economy. The chapters in these parts introduce the reader to such concepts as power politics, international law, trade, the environment, and the North-South Gap, to name a few. It makes analytical power strong by giving the answers to analytical questions, which is also helpful for current affairs paper..it tells better how to attempt the papar and which words one should use while solving the paper.