Hi Rahul,

The csab brochure states that:

If a candidate gets a seat allotted in Special Round-I and opts for “SURRENDER and NOT PARTICIPATING in NEXT ROUND”, his/her Participation Fee and Seat Acceptance Fee (if paid) will be refunded after deducting Rs 5,000/-. 

Thus you'll get money after deduction of Rs. 5000. For example, You'll get Rs. 31500/- for gen/obc-ncl.

Thanks.