Darshan, VIT does not reveal the cutoff marks as the exam is held in many sessions on different days and the level of the paper may vary slightly. So your actual score would be normalised to prepare the AIR list.
The cutoff is technically the last rank which could grab a seat in the given branch at the given campus. For IT in Vellore campus, the cutoff is around the AIR of 12000.
You can find the branch wise cutoff for Vellore and Chennai campus for 2015 and 2016 on the given link: https://engineering.careers360.com/articles/viteee-cutoff/amp
Cutoffs for some branches in 2016 in Vellore campus have been mentioned below:
Similarly for Chennai campus, the cutoffs were:
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