Hello aspirant
These are few important topics
Synchronization Mechanisms, Concurrency in IPC environment
Virtual Memory,CPU Scheduling Algorithms,Techniques of Memory Management

Book you can refer is
Operating System Concepts by Galvin
Modern Operating System by Andrew Tanenbaum
Operating Systems by Stallings

Kindly go through the given link below it will help you regarding your preparation

https://engineering.careers360.com/articles/what-are-best-books-for-gate-cse

Hello,


Best book for OS is - Operating Systems Concepts (OS) by Peter Baer Galvin.

Other books for GATE CSE :

TOC and Compilers (Compilers: Principles, Techniques, and Tools) by J.D. Ullman.
Database Management Systems - DBMS by Korth
Computer Algorithms by Ellis Horowitz.
Data Communications and Networking by Behrouz A. Forouzan.
Digital Logic and Computer Design by Morris Mano.

I hope this helps.

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