Hello aspirant,

That's a good idea to start preparation for GATE early in first year itself. There are many platforms from which you can get GATE coaching. GATE notes will all be available online.

Best books for GATE CSE.

• TOC and Compilers (Compilers: Principles, Techniques, and Tools) by J.D. Ullman
• Digital Logic and Number representation by Morris Mano
• “Database Management Systems” by Raghu Ramakrishnan
• Theory of Computer Science: Automata, Languages and Computation by Mishra K.L.P.
• The C Programming Language Kernighan, Ritchie
• GATE Practice Sets by Pearson
• Software Engineering: A Practitioner’s Approach by Pressman
• Data Structures Using C Aaron M

For more information about best books fir GATE CSE go through below link.

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

Hope this helps.

Good Luck!!