Hey,
You can surely crack the Bank PO Exams with correct preparation and positive outlook. First of all, know the syllabus well. Go through the previous years question paper. If you practice the previous year papers it will really help you in time management. You can go through these books:
Fast Track Objective Arithmetic (Arihant) Rajesh Verma
Quantitative Aptitude For Competitive Examinations (S.Chand) R.S.Agarwal
A new approach Verbal and Nonverbal Reasoning (Arihant) by BS Sijwali
A Modern Approach to Verbal and Nonverbal Reasoning (S.Chand) by R.S.Agarwal
Lucent General Knowledge
NCERT
Pratiyogita Darpan
Manorama Year Book
Hope this helps.
Good luck.