If you are a student of Vellore Institute of Technology, Chennai then you are most probably in the engineering. As a result, while filing up the application form of the NEET, you have to apply for the NEET code 2 as you will be addressed as an Dropper. You need not have to provide any other certificate from the college i.e., VIT. So you will need the 6-12th class Bonafide certificate.

To predict the college you can get on the basis of the rank provided, visit the link below:

https://medicine.careers360.com/neet-college-predictor

To know more about MBBS as a career, visit the link below:

https://www.careers360.com/courses/mbbs-bachelor-of-medicine-bachelor-of-surgery

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