Hey!

Yes, you can fill CMAT from at home with a good internet connection and technological device, phone or laptop whichever is feasible. Go to this website

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

Do the account registration process, then login and fill your details for the exam. Then, you will be just left with the payment. And, a few weeks before the exam. You will end up getting the Admit card. So, best of luck for CMAT. Prepare well and ace it.