Hello aspirant,

Very first thing you should do that you should take science stream in your 10 + 2 level. After completing 10 + 2 you you should give the joint entrance examination or give the  examination held by ISRO.By jee main rank you can get admission in engeenering college in space technology or aeronotical engeenering dept. After b.tech & m.tech you can continue your research works. There is another way also you just simply take your honours in Physics do the msc. & start your research work.

Best of luck.

May this will help you