You're looking for a guide or a downloadable PDF of the Class 9 Computer Science book by Sumita Arora. Here's some information that might help:
While NCERT does not publish a specific "Computer Applications" book for all schools, the NCERT "Foundation of Information Technology" book for Class 9 is very similar and available for free download from ncert.nic.in. sumita arora class 9 computer book pdf
“Where is your book, Rohan?” the teacher asked, peering over his spectacles. You're looking for a guide or a downloadable
Draft 1 (Inquiry / Request – for forums or study groups) “Where is your book, Rohan
ICSE Computer Applications: A variant specifically structured for the Indian Certificate of Secondary Education (ICSE) syllabus. Core Topics and Syllabus Coverage
Legitimate Digital Access Good news for digital learners: Sumita Arora’s publisher (Dhanpat Rai & Co.) does provide official eBooks.