Quantitative aptitude by R.S Agarwal is the best book for preparing arithmetic portion for all types of govt. exams. It is very concise and to the point. The examples are very lucid and solved in very tricky way so as to give a clear understanding of the topic. It is for those who wants to make their foundation in quantitative section of all govt. exams. So, if you are preparing for ssc, bank-po, ibps, mba, mat & ssc-cgl, this is the best book to get started for your basics of maths to be covered. The arithmetic portion mainly covers Number system, Time & work, profit & loss etc.