http://www.aicte-cmat.in/College/Index_New.aspx

You have to look at this site for registration and links.
Make a login first and then register with your documents and photograph.
Instructions for CMAT registration are given on the site. Instructions for the document upload are also given on the site but first you have to make a login id with your proper email id which you use regurlarly.

cheers!
Team Gill Sir.