hello Suparna!

The eligibility for MBBS counselling is as follows:

1. The candidate must have secured an aggregate of 50% (For SC/ST/OBC)i n Physics, Chemistry and Biology in 12th Boards from a recognized institution.
2. The candidate must have scored atleast the cutoff marks in NEET UG. The cutoff for OBC category is 146-113 marks.

You have not mentioned your NEET score. However, since your 12th aggregate does not meet the required percentage, you are not eligible to attend NEET counselling.

You can refer to the article below for detailed information:

https://medicine.careers360.com/articles/assam-mbbs-admission

Don't lose hope. You can give your boards and NEET another time another time with full preparation. Or you can also opt for other courses like B.A, B.Sc as well.

All the best!