The objective type portion will have papers in reasoning, quantitive aptitude, general awareness and English. The descriptive type paper will have comprehension, analysis of situation and language ability. You can prepare from Quantitative Aptitude by Abhijit Guha and Objective Ques Bank (math) by R.K.Gupta and J.P Arya. For general awareness, if you read read the daily newspaper and watch news broadcasts, that should do. You could also use magazines such as CSR, Competition Master, Banking service Chronicle and Manorama Year book.