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For English section in IBPS RRB PO you can refer Wren and Martin to cover the grammatical portion, use Word Power Made Easy for building vocabulary, and for practice purpose you can refer SP Bakshi's Objective General English, in addition to this go through newspaper editorials of The Hindu or The Indian Express on a daily basis, in case of reasoning you can refer RK Agarwal's A Modern Approach to Verbal and Non-Verbal Reasoning, MK Pandey's Analytical Reasoning, for quantitative aptitude refer RK Agarwal' s Quantitative Aptitude for Competitive Examination/ M Tyra's Magic Book on Quicker Mathematics, Data Interpretation by Arun Sharma, to know more details regarding this, visit our page at https://competition.careers360.com/articles/best-books-for-ibps-rrb