Hey Muskan,

Thanks for reaching out!

Yes,Even If you failed 12th twice, you can appear as a regular candidate in the MP Board exams by taking fresh admission in a recognised school. Some students opt for dummy admission (enrolled but not attending),mainly to focus on JEE or NEET. Though It's unofficial and may be harder to get if you have failed twice.If the school agrees, submit your two previous marksheet and documents and can appear like any other regular student.The MP board has no restriction on reappearing and your past health issues won't affect your eligibility.

However it's advisable to check with your school for exact rules and criteria

All the best!!