Hello Aspirant,

See for NEET only those candidates are eligible who satisfy the NEET UG Eligibility criterion which says that "you can appear for NEET 2021 if you have passed/appearing for your class 12th/PUC with Physics, Biology, Chemistry and English as mandatory subjects with minimum aggregate of 50% in PCB for Unreserved category, 40% for OBC/SC/ST and 45% for PwD certificate holders.

But as you have mentioned that you got failed in class 12th so you must not be eligible for NEET .

For complete details about NEET 2021 Eligibility criteria kindly check out the link given below :-

https://medicine.careers360.com/articles/neet-eligibility-criteria

I hope this information helps you.

Good Luck!!