Hello student if you failed in Physics examination in 2017 yes you can appear for on demand examination through NIOS board it's an recognized board of education.

And after that you can pursue your graduation as per your preferences.

I request you to please help me with the preferable course you're willing to pursue after passing Physics examination so that I can check and provide you with the exact information about eligibility criteria.

Feel free to comment if you've any doubt

Good luck