First of all, Congratulations for Scoring 85% marks in 12th.

Now , Let me clear your doubt , the basic criteria to be eligible to give VITEEE is to Score 60% or more in Boards (VITEEE is the entrance exam taken by VIT university through which you can get any branch in any VIT (Vellore or Chennai )).

Vit doesnot give seat through Board marks , it gives you seat through their entrance exam(VITEEE)

I think your doubt is cleared ..and all the further entrance exams eligibility and further details you can go through their website (link is given below).

link - https://viteee.vit.ac.in/