Fast Track aptitude book by Arihant publication is the best book so far to solve, practice, and doing mastery in airthmetic. 95% questions in exams like SSC CGL, 10+2, CPO SBI AND IBPS PO/CLERK RAILWAYS AAO. etc can be solved accurately and precisely in less time.
Each chapter in this book contain as:
Basic formulaes easy to grasp with solved examples
fast track formulaes to solve problems in no time with examples
Basic and higher level Exercises(with solution) covering previous years exams questions.
One can easily cover this book within one month or less by just studying 2 to 3 hours a day can secure good marks in aptitude portion. if one as less knowledge of maths or arts student must buy this book. I am sure that YOU will not required any other book.