If you are looking for a computer science book, one popular choice is "Computer Science: An Overview" by J. Glenn Brookshear. This book provides a comprehensive introduction to the field of computer science, covering topics such as computer hardware, software, algorithms, programming languages, data structures, and more.

In terms of NCERT textbooks, the National Council of Educational Research and Training (NCERT) is the authority responsible for publishing curriculum-aligned textbooks in India. For computer science, NCERT offers textbooks for classes 11 and 12, titled "Computer Science with Python" and "Computer Science with C++" respectively. These textbooks cover various programming concepts and practical applications.

Please note that the availability of these textbooks may vary depending on your location and educational institution. It is advisable to check with your school or local bookstore for the specific NCERT textbooks you require. Additionally, online platforms such as Amazon or Flipkart often have these books available for purchase.