You can refer the following books:



1. The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg



2. Doing Simple Math in your Head by W. J Howard



3. How to calculate quickly by Henry Sticker



4. Rapid Math Tricks and Tips: Thirty Days to Number Power by Edward H Julius



Read the following article for more:

www.bschool.careers360.com/articles/cat-must-read-books-for-preparation

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