Hello student,

National Board of open schooling is a open board, which is under control of human resource department ministry of India. NIOS has there on study patterns and book patterns. Usually day provides books, curriculum study material and joint certifications. NIOS books are not published by any public authorisation that's why you can not buy this book in markets.

Still if you did not get any kinds of study materials you have to approach your study centre which you have selected during the time of admission. Sometimes the books are sent to the study centres and you have to collect those from them. You may can contact direct to the NIOS authority by calling them for sending mail them on their details. You can find these details by clicking on the link below

NIOS (https://www.nios.ac.in/about-us/at-a-glance.aspx)