Hello Student!

The National Institute of Open Schooling(NIOS), formerly National Open School is the board of education under the Union Government of India. And one of best guide for Biology of class 12 is :

TOP NIOS Biology Guide for Class 12 (T-314)

Publisher : Top Publications

Best of Luck!

Hello Student!

As all books are helpful for studying, you can refer to the link I am providing below, it has Books for NIOS Books for Class 12th.

NIOS Books for Class 12 (All Subjects) - Download Pdf Here (careers360.com)

Please refer to this link.

If you have may more questions please revert back.