All government and govt. aided colleges in Kerala admit students via KEAM only. Most good private colleges also consider your KEAM ranks along with DONATION for admission. It will cost you around 1.5 lakh rupees for fees excluding hostel and mess. If you haven't written KEAM, your chances in Kerala is very low. If you don't have fair chance in cusat, I think you better your level best in your state itself if you are a north Indian. Best of luck!