Some bank PO exam books are
Quantitative Aptitude for Competitive Examinations – Dr. R.S.Aggarwal – S.Chand and Co.
Quantitative Aptitude for Competitive Examinations – Abhijit Guha – Tata McGraw Hill
Objective Arithmetic by S.L. Gulati
Verbal and Non Verbal Reasoning
A Modern Approach to Verbal & Non-Verbal Reasoning – Dr. R.S.Aggarwal – S.Chand and Co.
Analytical Reasoning – M K Pandey
Non Verbal Reasoning – R.S Aggarwal
Verbal Reasoning – R.S Aggarwal
Objective General English – Dr R.S.Aggarwal – S.Chand and Co.
Objective English for Competitive Examinations – Hari Mohan Prasad, Uma Rani Sinha – Tata McGraw Hill High School English Grammar and Composition – Wren and Martin – Pearson Longman Word Power Made Easy (English Vocabulary)