Hello Pavan Kumar G We all know that the rank vs mark in each an every academic year varies with the toughness of the paper and the quality of the set of candidates in that year.But marks ranging from 220-230 may probably fetch you a seat in iit madras aerospace engineering.But it is advisory to maintain a rank between 1k-2.5k for a safer zone in achieve your dream department.Also Aerospace Engineering Dual degree is available in IIT-M which is also almost equivant in terms of rank. Given below are the stats for opening and closing ranks for aerospace engineering in iit-m for all categories in 2018.OPEN Gender-Neutral 1270-2706 OBC-NCL Gender-Neutral 875-1268ST Gender-Neutral 385-416 SC Gender-Neutral 292-798 Dual DegreeOPEN Gender-Neutral 2918-3704 OBC-NCL Gender-Neutral 1620-1621SC Gender-Neutral 504 -910 ST Gender-Neutral 252-252The above mention is the previous academic years seat allotment a variation would be there every year but always iin the range of 1k to 2.5k.Still, the best advice  will be to TRY YOUR BEST, and get AS GOOD A RANK AS YOU CANAll the best!!!