Dear Rahul,

The total number of students appeared in the exam is the total number of rank, there is not a fix data still around 2 lacks students are appear per year in vitee and that would be the rank.

Both of the campusus are considered as a good campus for any course but still if you go with the rating then Vellore campus beats the Chennai campus in every prospect like Placement, faculty, Infrastructure, management. If you are getting both then I will prefer you to go with the Vellore campus, now its totally up to you whether you take Vellore or Chennai.

Best Of Luck!!!