IISc Bangalore does not offer a B.Tech or undergraduate program in Aeronautical Engineering through JEE Main. IISc offers a B.Sc (Research) program for undergraduate students, and admission to this is possible through JEE Advanced, not JEE Main.

For M.Tech in Aerospace Engineering at IISc, admission is through GATE, not JEE.

If you are interested in Aeronautical or Aerospace Engineering at the undergraduate level, you should target IITs like IIT Bombay, Kanpur, Kharagpur, or Madras. These branches usually require a rank within 1500 to 3000 in JEE Advanced for general category students. JEE Main is only used as a qualifier for JEE Advanced in this path.