Please suggest best combined book to prepare for IBPS SO(IT)....

I would suggest you to go through the below names -

Reasoning -

A Modern Approach To Verbal & Non-Verbal Reasoning Revised Edition - R. S. Aggarwal



A New Approach to Reasoning Verbal and Non-Verbal 1st Edition - BS Sijwali, Indu Sijwal



The Hand on Guide to Analytical Reasoning and Logical Reasoning - Peeyush Bhardwaj



Quantitative Aptitude -

Quantitative Aptitude For Competitive Examinations 17th Edition - R. S. Aggarwal



Magical Book On Quicker Maths 3 Edition - M Tyra



Quantitative Aptitude Test - N. K. Singh



General English -

Objective English for Competitive Examinations - Hari Mohan Prasad, Uma Rani Sinha



Objective General English 22nd Edition - R. S. Aggarwal, Vikas Aggarwal



Objective English 4 Edition - Edgar Thorpe



Professional Knowledge -

Computer for Competitive Exams: Fundamental of Computer with MCQs : Fundamentals of Computer with Multiple Choice Questions 1st Edition - RPH Editorial Board



Objective Computer Awareness for General Competitive Exams 1st Edition - R Pillai





Note : As there are many books available in the market so better to go for standard ones also go for the preparation material which makes all your concepts clear and strong.



Hope this helps!!!