Dear Ambika,

Following are the some of the best books for the preparation- 

• Magical book on quicker mathematics by M Tyra.
• Data Interpretation by R.S Agarwal.
• Objective mathematics by Dhrmpat.
• Quantitative Aptitude for Competitive Examinations by Tarun Goyal.

Regards

Hii,

Selecting a Bank PO Book is very important to crack Bank PO exam.

The follow books can also be referred for SBI,IBPS,PO,clerk.Many bank exam coaching institutes follow these books.

In bank exams you will have subjects like aptitude, reasoning,Verbal ability and general knowledge topics.

• Quantitative aptitude for competitive examinations by R.S Agarwal
• Modern aproach to verbal and non verbal reasoning by R.S Agrawal
• Word power made easy by Norman Lewis
• Banking awareness the complete book for IBPS ,Bank PO and clerk examinations by Arihant
• Analytical reasoning (Bank PO reasoning books) by MK pandey.

Prepare well,All the Best..,