Hey as per my idea preparing for banking sector is good choice as it give good job opportunity and also make future secure
Nationality
Candidate should be Indian

Qualification
Candidate should have done graduation

Selection criteria
Written test
Interview

Syllabus
Reasoning
Aptitude
English
General knowledge

Here I am giving you reference books for IBPS Specialist Officer
Kiran's IBPS Specialist Officers I. T. Officer CWE SPL - 5 Professional
IBPS-CWE Specialist Officer Cadre IT OFFICER Scale I&II Recruitment Exam
Kiran's Ibps Specialist Officers I. T. Officer Cwe Spl - 5 Professional Knowledge Practice Work Book Paperback (english) 2015
IBPS (CRP SPL-V) Specialist Officer IT Officer 2016 Study Guide
Professional Knowledge for IBPS/ SBI Specialist IT Officer Exam
Ibps (crp Spl-v) Specialist Officer 2016 Study Guide Paperback (english) 6th Edition
IBPS Specialist Officers CWE I.T. Officer Online Exam Practice Work Book (With Free CD)