This book is awesome to learn Mathematics large calculations in simple form. I have this book an I use it many times when number of calculations are in front of me hahaha!. So I suggest you to everybody who have no interest in math an want to learn some tricks of Maths to show your friend who is intellegent in Maths. Sure he/she will impress from you an ask you to tell him/her tricks. But one thing I suggest you that this book is available in sankrit and English medium. So you have to get start this book under the guidence of teacher. Otherwise you can't read and learn this book in proper way.
Thanks!
Maths Lover