Hey Ravi, I couldnt find any such course at IISc Bangalore. It is an Institute with research fields focussed so no B.tech courses are offered by them. Infact, the only UG program they offer is Bachelor of Science. You have scored less marks in Jee mains but still you can look for other engineering colleges offering this course. Since you have sc quota you may get some advantage. Here I am providing you the list of engineering college offering aeronautical engineering qualified through jee mains (https://engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?f%5B0%5D=sm_college_course_level%3AUG&f%5B1%5D=sm_college_degree%3AB.E%20/Btech&f%5B2%5D=sm_course_offered%3AAeronautical%20Engineering&f%5B3%5D=sm_quali_exam%3AJEE%20Main). I hope this will be helpful for you and provide you an insight of the various options available and which to choose the best.