There are several books available for IBPS Specialist Officer Exam online.

I am suggesting you for best books available online which helps you to crack it:

Specialist Officers (I.T.) IBPS-CWE (Paperback, Think Tank of Kiran Prakashan, KICX, Pratiyogita Kiran)
₹275₹2956% off
Author: Think Tank of Kiran Prakashan, KICX, Pratiyogita Kiran
440 Pages
Language: English
Publisher: Kiran Prakashan

IBPS - Common Recruitment Process Specialist Officers IT Officer Scale 1 & 2 (With CD) : Includes Solved Paper 2014 5 Edition (English, Paperback, GKP)
₹590
Language: English
Binding: Paperback
Publisher: GK Publications
ISBN: 9789351443988, 9351443981
Edition: 5, 2014
Pages: 915

Comprehensive Guide to IBPS-CWE Specialist IT Officer Scale I & II - 2nd Edition (Disha Experts)
₹610
Publisher: Disha Publication
ISBN: 9789384905002, 9384905003
Pages: 816

IBPS CWE SPL - 4 Specialist Officers / I.T. Officer Self Study Guide - Cum Practice Work Book : Including Model Solved Papers Of: 2011 - 2014 (With CD) (Paperback, KICX, Think Tank of Kiran Prakashan, Pratiyogita Kiran)
₹625
Author: KICX, Think Tank of Kiran Prakashan, Pratiyogita Kiran
920 Pages
Language: English
Publisher: Kiran Prakashan

IBPS - CWE (4) Specialist Officers Cadre IT Officer (Information Technology / Personnel Officer) Scale 1 Online Exam 2015 : With 3 Self Enhancement Tests 2nd Edition (English, Paperback, Amar Jyoti)
₹340
Language: English
Binding: Paperback
Publisher: Arihant
ISBN: 9789351768647, 9351768643
Edition: 2nd Edition, 2014
Pages: 760

IBPS Specialist Officers CWE I.T. Officer Online Exam Practice Work Book (Paperback, Think Tank of Kiran Prakashan)
₹609
Author: Think Tank of Kiran Prakashan
896 Pages
Language: English
Publisher: Kiran Prakashan

IBPS CWE SPL - 4 Specialist Officers / Marketing Officer Online Exam Professional Knowledge Practice Work Book : Including Model Solved Papers Of 2012 - 2014 (Paperback, KICX, Pratiyogita Kiran, Think Tank of Kiran Prakashan)
₹280
Author: KICX, Pratiyogita Kiran, Think Tank of Kiran Prakashan
272 Pages
Language: English
Publisher: Kiran Prakashan

IBPS CWE : Specialist Officer 2015 (Paperback, CBH EDITORIAL BOARD)
₹490
Author: CBH EDITORIAL BOARD
300 Pages
Language: English
Publisher: Cosmos Bookhive

Comprehensive Guide to IBPS-CWE Specialist IT Officer Scale I & II : Specialist IT Officer - Scale 1 & 2 1st Edition (English, Paperback, Disha Experts)
₹635
Language: English
Binding: Paperback
Publisher: Disha Publication
ISBN: 9789383379880, 938337988X
Edition: 1st, 2013
Pages: 796