Hi Sahil,

In my opinion I would say do not worry at all. Just try to ask them again and again why the books are not available for the preparation, you can simply told them that you need books for study without them you will not be able to pass. If still they don't give any positive response then kidnly take your parents or anyone and then you can ask.

Pressurize them and put your importance and need over them so they will understand the need of books. And you have paid the fees as well so you can simply write a complaint letter and post them to the higher authorities of NIOS board.

If still this not works, then go for second hand books as they cost lower then new ones.

Hope this will help you for sure and do not worry, everything will be alright.

Access these links: https://school.careers360.com/articles/nios-study-material

https://school.careers360.com/boards/nios/nios-books-for-class-12

Thank you and good luck:)