For aerospace engineering you need to take physics chemistry mathematics in class 12th and then appear for entrance examination for the colleges in which you want to pursue aerospace engineering if you consider the premier Institute of the country for aerospace engineering then the IITs are the best for aerospace engineering the four IIT offer aerospace engineering courses which are IIT Bombay IIT Madras IIT Kharagpur IIT Kanpur out of which IIT Kanpur is known as the best  for aerospace engineering, to get admission into aerospace Engineering at IIT you need to first appear for JEE main  qualifiy it  to appear for JEE advanced and get into top 5000 to get a seat in to aerospace engineering.