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For IBPS PO and SBI PO preparation, you can refer some IBPS PO books to the known author or can go for online study material. There are many websites which offer study material and test series or previous year question paper for IBPS PO.
Here I suggest some books which you can refer to bank PO preparation
Quantitative Aptitude for Competitive Examinations by R.S. Aggarwal
Advance maths for General Competitions by Rakesh Yadav
Advance Maths: M.tyra
Word Power Made Easy by Norman Lewis
General English by SP Bakshi
A Modern Approach to Verbal & Non Verbal Reasoning by R.S. Aggarawal
A New Approach to Reasoning Verbal & Non-Verbal by B.S. Sijwali
Banking Awareness by Arihant
Banking Awareness by Disha Publications