The exam syllabus is based on your Class 12 Physics, Chemistry and Biology syllabus. 

Hey Nitya.

You can look for the following books

Forensic Science in Crime Investigation by Nabar BS

Forensic Science: An Introduction to Scientific Crime Detection-Third Indian Reprint by Walls

Forensic Science: Principles & Concepts by Nishant Singh

Forensic Science: The Basics, Second Edition by Jay A. Siegel

Forensic Science UGC Net/JRF-MCQ's by Dr. Anu Singla

Hope this helps. All the best.