Bank Probationary officer Exam has three stages:
1. Written Test
2. Group Discussion
3. Personal Interview
The written test will be of objective type question consisting of
1. General Awareness
2. General English
3. Quantitative Aptitude
4. Reasoning Ability
5. Marketing Aptitude/Computer Knowledge
Candidates are also required to score a minimum 40% marks(35% for SC/ST/PWD/XS) marks on aggereate to be considered for being called for interview.
You can follow R S Agarwal Quantitative Aptitude, Verbal &nonverbal Reasoning regularly. There are a lot many books that you can refer to. Consider solving previous years test papers to get the feel of the material.
Hope this helps.