Aerospace Engineering

Aviation and aeronautics both have their basis in flight Science and engineering. Depending on your end goal, one field may be better suited than the other. You should pursue a course which you feel more comfortable studying/doing. Both these courses may have similarities and at the same time are very different from each other. Both are explored in more detail in the following sections.
Aviation Management: Students majoring in aviation can train to be pilots or navigators. Aviation management programs teach you the basics of airport operations that include applications such as aviation law, security issues, aircraft design and weather issues. The Federal Aviation Administration (FAA) and other federal agencies, such as the armed forces, are venues for you to study to become an air traffic controller.
Aerospace engineering: Aeronautic or aerospace engineers can work for government agencies, such as the National Aeronautic and Space Administration (NASA), as flight engineers, designers and members of mission control. Aircraft or weapon manufacturers also hire aeronautic engineers to design airplanes, helicopters, spacecraft, rockets, guidance systems and other defense systems.
Regards.

Dear Shudhnshu!
Make career in Space Science is not easy but not difficult too. Make your target to do B.Tech from 'Indian Institute of Space Science and Technology, Kerela'. This is the only autonomous institute in west Asia which provides degree in space Science from Bachelors to doctorate. They are in the collaboration with California Institute of Technology (CalTech) for student exchange programme. They are directly controlled by Department of Space (ministry of Science) and ISRO. For getting admission here you just need to score approximately 5% in JEE Advance exam (for general category).So, my opinion says that start preparing for JEEs for do well in JEE Mains Exam. And then for JEE Advance.
hope this helps.
Ask any query at anytime.
Good Luck.