Dear Rakesh, that is an impeccable academic record that you have got. MIT Chennai conducts admissions to its B.Tech program through a single window counselling called TNEA conducted by Anna University. For being eligible, you should have scored a minimum aggregate of 50% in your 10+2. With your marks, irrespective of your Category, you have decent chances of getting to MIT for Aeronautical Engineering. So do not worry about it. Please keep an eye on the official website for announcement of TNEA 2020 schedule.