Selection of program and city of choice

I thought the XAT registration process was over when I paid the 1000 bucks initially. Now I received an email asking me to select courses of my choice along with the test center and pay 1500 rupees. It also wants me to take a printout of the confirmation receipt and MAIL it to them within 15 days.

Should I speed post my confirmation page so that it reaches there before 21st? Can someone tell me what has to be done next?