Hello aspirant, 

To become an aerospace engineer,you have to take a b. Tech professional degree from a recognized university.And it is a 4 year course.After plustwo in science you can go for B.Tech.choose aeronotical engineering department in B. Tech to become an aerospace engineer.After completing b.Tech you are an Engineer. 

hello 

the minimum required qualification for aerospace engineering is that atleast 60% to 70% in the 10+2 and with maths and physics , chemsitry as the complusoriy subjests in 10+2 

i hope you understood 

good luck