There are various books available in the market as well as online for preparing SBI Bank PO exams. However the following given books can help you to get the basic knowledge of the questions put in SBI Ba nk PO exams:
1. Test of Reasoning/Reasoning Ability : By R.S.Agarwal
2. Quantitative Aptitude By R.S.Agarwal
3. English grammer's book:- Rein and Martin.
Besides these books Banking Service Cronicle can help you revise and practice for SBI Bank PO exam.