Hello Y Supriya

Yes, you have pay the fee even though you got a good rank. In private colleges seat only allocated by govenment counselling remaing everything related to college should be pay by students itself. The fee structure of CMC Vellore 

https://medicine.careers360.com/articles/cmc-vellore-mbbs-fee-structure

in above link you can the details of CMC vellore.

Hope this will helpful

Good Luck.