It seems that your keam marks are quite low as 50% marks are considered for the admission in medical courses. It is difficult for you to get any govt. college because of the law marks in KEAM as per the information provided by you. So it is the better suggestion for you that you prepare to go with private colleges. Also you will bw subjected to the online choice filling rounds where you can try your luck by choosin the govt. colleges and then give your preferance to Grant Aided colleges, if you fulfil the criteria then you can get the seat otherwise be prepare to go with the private college.