Old books available in Kolkata

Olympiad previous years papers book for NSO Olympiad, Class – 7 is a practice book which contains sample papers for students who are preparing to take the National Science Olympiads. Science experts carefully tailored this book for students who want to assess their scientific and reasoning abilities and prepare for the Science Olympiad. It will assist the student in mastering their grip in problem-solving areas. Students' confidence will be boosted by the practice papers, which will also show them where they fall short.

I was bought this book but now I want to sell for a new book. Its a new book but old