which publication is best for gate computer science??

You can check the recommended study material below for your preparation

Engineering Mathematics - Discrete Mathematics and Its Applications by Kenneth Rosen

Higher Engineering mathematics by B.S. Grewal

Advanced Engineering Mathematics by Erwin Kreyszi

Digital Logic - Digital Design by Morris Mano

Digital Electronics by S. Salivahanan & S. Arivazhagan

Computer Organization and Architecture - Computer Architecture – A Quantitative Approach by Hennessy and Patterson

Computer Organization and Embedded systems by Carl Hamacher

Programming and Data Structures - The C Programming language by Dennis Richie

Classic Data Structures by Debasis Samanta

Algorithms - Introduction to Algorithms by Cormen

Data Structures & Algorithms by R.S. Salaria

Theory of Computation - An Introduction to Formal Languages and Automata by Peter Linz

NPTEL lectures by Kamala Krithivasan

Compiler Design - Compilers: Principles, Techniques and Tools by Aho & Ullman

Compiler Design in C by Allen I Holub

Operating System - Operating System Concepts by Galvin

Modern Operating System by Andrew Tanenbaum

Operating Systems by Stallings

Databases - Database System Concepts by Henry. F. Korth

Normalization and indexing by Shamkant B. Navathe

Computer Networks - Computer Networking: A Top-Down Approach

Data Communications and Networking by Kurose & Ross and Behrouz A. Forouzan

Computer Networks by Peterson & Davie

Good Luck!!