Hi

As in your case, you have failed in one subject (chemistry) and you are going to write the supplementary exam. Now you have to pass the exam and score atleast 60% and above in Maths/ Biology, Chemistry and Physics in 12th Board Examinations. 

Candidates from SC/ST Categories have to score 50% in the above mentioned subjects. Also, candidates from the North-East have to secure 50% and above in all the subjects. 

The students who have studied Maths, Biology, Chemistry and Physics are eligible to appear for the exam.

Check this link to know better about the the Admission Criteria at VIT University in detail:  https://engineering.careers360.com/articles/viteee-eligibility-criteria.

Best of Luck.

Hope this helps.

Cheers!