As you want to get the details of preparation tips for the Corporation Bank's PO exam so here it is for you:

Plan early for common exam
The question paper will most probably contain the following sections:

Reasoning, Quantitative aptitude or Numerical reasoning, English, General awareness & Computer knowledge

Take efforts
Understand the exam pattern & frame shortcuts or easy methods
Regular practice
Keep an eye on the upcoming bank exams

Practicing leads to perfection
Coaching centre
Self study
Previous year`s solved question papers, guides

Reference Books:
Books for General Awareness
• Advance Objective General Knowledge by R. S. Aggarwal
• General Knowledge 2013: Essential ‘Knowledge Capsule’ in General Awareness and Current Affairs by Manohar Pandey
• General Knowledge and Current Affairs by RPH Editorial Board
• General Knowledge and Current Affairs: Objective Type Questions by Khanna and Verma
• General Knowledge at A Glance by RPH Editorial Board
• General Knowledge Digest and General Studies by K.Mohan
• General Knowledge Encyclopaedia by Alok Gupta
• General Knowledge Manual by Barry ‘O’ Brien
• Handbook of General Knowledge by B. N. Ahuja
• Objective General Knowledge by Tarun Goyal
• Objective General Knowledge by Edgar Thorpe and Showick Thorpe

Books for English
• A Comprehensive Book of English Grammar by Dr.B.B. Jain
• Better Word Power by Vimal Bhatnagar
• Complete English Grammar by S.C. Gupta
• English Is Easy by Chetananand Singh
• Objective English for Competitive Examinations by Hari Prasad and Uma Sinha
• Objective General English by R. S. Aggarwal
• Objective General English by S.P. Bakshi
• Quick Learning Objective General English by R. S. Aggarwal
• Synonyms and Antonyms by Ashok K. Singh
• Word Power Made Easy by Norman Lewis
• Wren and Martin English Grammar

Books for Numerical Ability
• Arithmetic for Competitive Examinations by Jain and Sharma
• Magical Book on Quicker Maths by M Tyra
• Numerical Ability and Mathematical Aptitude by Dr.A.B.Rao
• Objective Arithmetic by R. S. Aggarwal
• Quick Arithmetics by Ashish Aggarwal
• Quicker Objective Arithmetic by Dr. Lal & Jain
• Super Quicker Arithmetic by R.Gupta
• The Pearson Guide to Objective Arithmetic for Competitive Examinations by Dinesh Khattar

Books for Reasoning and Military Aptitude
• A Modern Approach to Verbal and Non-Verbal Reasoning by R.S. Aggarwal
• A Modern Approach to Verbal Reasoning by R.S.Aggarwal
• An Advanced Approach to Data Interpretation by R. S. Aggarwal
• Analytical Reasoning by M.K.Pandey
• Non Verbal Reasoning by Javed
• Non Verbal Reasoning by R.S. Aggarwal
• Quantitative Aptitude by R.S. Aggarwal
• Quantitative Aptitude by T.S. Jain
• Quantitative Aptitude for Competitive Examinations by Abhijit Guha
• The Aptitude Test Workbook by Jim Barrett