Hey,

Firstly I would say that there is nothing called a free seat in any medical College. It is just a misnomer. The better you score, the better College you get admission in. You can check their official website for getting the approximate fee structure (It might vary a little  next year).

http://stjohnsadmissions.in/html/fee_structure.html

All the best for your upcoming exam. Prepare well and hope you crack NEET.