With a Rank of 30000 in VITEEE, you have literally no chances of securing CSE at VIT Vellore atleast in the first 2-3 Categories. You might still have extremely low chances of IT or luckily maybe some empty seat at some of the CSE Specializations by Category 4 or 5. But you might just have to pay an extravagant tuition fee for the Course if you select a seat in Category 4 or 5. I would suggest you try securing CSE or IT at Chennai at Earlier Rounds of Counselling or maybe ECE or EEE at Vellore at earlier Categories of Counselling.

For more information and VIT Cutoffs do follow the link below

https://engineering.careers360.com/articles/viteee-cutoff/amp