Hello,

No, you do have to appear for Physics and Chemistry from NIOS if you have already passed 10+2 with Physics and Chemistry. You can appear for Biology exam from NIOS. But if you wish to improve your overall percentage and subject wise percentage in order to be eligible to appear for an entrance examination or apply for admission in Bachelor's Degree then you can apply for all the three subjects that is Biology, Physics and Chemistry.

To enroll you may visit the official website through the link given below

https://www.nios.ac.in/ (https://www.nios.ac.in/on-demand-examination.aspx)