Ok, here I am suggesting you some best books of C-DAC's Computerised Common Admission Test (C-CAT).

CDAC CAT exam Reference Books

These are the Referal books for each and every subject related to CDAC Exam. Check the CDAC Previous Papers along with referral books.

For Section A

English – Any High School Grammar Book

Quantitative Aptitude & Reasoning – Quantitative Aptitude Fully Solved (R. S. Aggarwal), Quantitative Aptitude (M Tyara), Barron’s New GRE 2012

For Section B

General Reference Book – Foundations of Computing (Pradeep Sinha & Priti Sinha)

Data Communication & Networking – CompTIA Network+ Study Guide (Todd Lammle)

Programming in C – Test your C Skills (Yashavant Kanetkar), Let Us C (Yashavant Kanetkar), Exploring C (Yashavant Kanetkar)

Data Structures – Data Structures Through C in Depth (S. K. Srivastava)

Operating System – Operating System Principles (Silberschatz, Galvin, Gagne)

OOPs Concept – Test Your C ++ Skills (Yashavant Kanetkar)

For Section C

Computer Architecture
Computer Organization & Architecture (William Stallings)

Digital Logic – Digital Fundamentals, 10th Edition (Thomas L. Floyed), Digital Design, 4th Edition (M Morris Mano)

Microprocessor –

The Intel Microprocessor, 8th Edition (Barry B. Brey), Microprocessor Architecture Programming & Application with 8085, 5th Edition (Ramesh Gaonkar), The Intel Microprocessor (Barry Brey)