You can get Aerospace Engineering very easily on merit as per your rank at the main campus of SRM. But, to be very Frank, Aerospace Engineering has really less scope in India and you might not get placed easily at the end of your course from the University.
It may sound bad to you but its the truth, i have my friends from IITs who’ve completed their bachelors at Aerospace Engineering (IITKGP) and now jobless because of the limited scope and vacancies in Civil Aviation in India.
Rest Choice is all Yours