Dear candidate, there is no reservation system in VIT campuses. Admission in VIT is done through VITEEE exam. They do not consider JEE Main score (except Bhopal campus). After 2016, the institute not revealed there cutoff but according to data available, rank of 5000-6000 in VITEEE exam can fetch you CSE in VIT Vellore main campus. At 16000 rank in VITEEE you can try for ECE or IT.

Hope, it helps!