HELLO LATHA
Your are asking about rank or marks. so ill be telling you both of it do not worry.
since the official cutoffs for 2020 are yet to be decided so let me give you the previous years data.
VITEEE Cut Off 2020, Closing Rank for VIT University
Mechanical (Spec. in Automotive Engineering)
12300 - 20000
Just to be on safer side if your marks is greater than 70+ then you might have a pretty good chance.
HOPE IT HELPS!!