Astronomy

Hi,
Institutes in India such as IISC, IIT Bombay, IIT Madras are also world known and in recent years they have achieved a lot. Getting into universities such as MIT, Georgia Tech etc. Will no doubt give you an edge, in the form of more advanced research and infrastructure, more practical knowledge and the international exposure. However securing a job abroad is not easy and will depend on your academic and research performance. Where you choose to study will depend on your career goals, where you want to settle, do you prefer global experience and more practical studies or more theory. A couple of years abroad with a foreign internship and some work experience will add value even if you come back to India later.

Dear Archita,
Certain points in this regards:
(#1) Only PCB wouldn't help. Some entrance exam requires maths as a mandatory subject also because of the huge involvement of physics, mechanics and astronomy. It is really important to have strong understanding of physics, chemistry and biology. Do not worry if you are not good with maths as you can still do something with the other subjects. You must remember that as far as Astrobiology is concerned you will be mainly self-taught.
(#2) Astrobiology, astrochemistry are some field which are under-evolve in India. You know that there is only one serious, dedicated institute in India which is sepcilized in this field.
Indian Astrobiology Research Center - They offers International Diploma programme in Astrobiology. However to widening the scope, you must to go abroad.
(#3) After your Bachelor's, Masters, and essentially Ph.D. you will work as Faculty or Research Analyst in Earth Science department or IARC itself. Nothing steps involved in it. IARC offers 4 months of Diploma in astrobiology.