Hii,

VIT has their own system of giving ranks.They give mild weightage to your board marks and whether it's your first attempt or not .Number of questions attempted  also have upper hand.Level of paper will be higher than boards but for sure lower than JEE MAINS.Some questions may be tricky.Just prepare and try to attempt all questions.Rank upto 9000 will land you with CSE in VIT,Vellore and upto 12,000 in VIT Chennai in first category.Otherwise you can pay more and get in 2nd category.

ALL THE BEST!!