How much did you score? Even if you belong to reserved category, still you have low chances of getting a good college. I am guessing you might have scored 25-27 and with that you won't get Anna University. You should score 45-50 to get the top MBA colleges.
You can try other colleges.
TNEA 2020 College Predictor
Know your college admission chances for TNEA Counselling based on your TNEA Rank