Dear aspirant,
See to be honest if you are going for core branches in these kind of private colleges like vit vellore, srm University, manipal University , I don't think it's a wise choice because the ROI factor of these colleges are very bad. If you are spending atleast 14-15 L in course of 4 years(considering you would get admitted in 1st category), you will end up getting salaries upto 3.5L or maybe 5L which is a very bad return.
But as per your question for civil engineering , rank under 50k is more than enough in vit vellore for category 1.
For cut off related information you can check out the link given below-
https://engineering.careers360.com/articles/viteee-cutoff/amp
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