If you want to clear your 12th then you should go for the open schooling system and can qualify your 12th. Then after that you can do your graduation in distance mode or regular mode as per your wish. So don't worry about that just start your studies and you can do really good in your career.

For a complete guide on Distance education in India visit the link provided below:

https://www.careers360.com/courses-certifications/articles/a-complete-guide-on-distance-education-in-india

I hope this answer helps. All the very best for your future endeavors!