which specialisation in aerospace engg in m.tech that i need choose if i wanna become space craft design engg.
IIST is the only one that offers a course that is remotely connected to Aerospace
as for space craft building, its not open to public so either you will have to check IIST or NASA. For IIST GATE is the entry point. Any other courses from any other institute is really not advisable.
For further information, you can go through the below website -
http://www.engineering.careers360.com
Hope this helps!!!