Aerospace Engineering

Aeronautical engineering is indeed a tough ground to conquer. It is where you need to be very much focused on the new arriving technologies in the aerospace field and their application. There are certain hallowed institutes in India itself like the IITs including IIT Kharagpur, IIT Mumbai, Jadavpur University and some other private engineering colleges which offer Bachelor of Engineering degree in aeronautical course and many more upcoming colleges which will tend to offer this course. It completely depends on your potential and your ranking in varoius entrance exams as to which college you get into if you want to pursue aeronautical degree. I would mostly ask you to prefer the old prestigious IITs and certain other government colleges only because the placement record for those colleges is good indeed and the faculty is also a renowned one.

Dear Bharath,
You can be a part of ISRO by choosing any of the branches through direct recruitment done by ISRO itself. Opt for some of the good universities like LPU, SRM, VIT, etc. For your degree, they are offering various specializations in B.Tech. They have their different criteria for admissions. Some offer admission on basis of JEE scores, some offer admission on basis of their own tests and some offer admission on the basis of both. Some even offer direct admission on basis of your marks in class 12th. Some of the universities also offer scholarships on basis of your performance in class 12th or JEE or even during the course. All these universities offer world-class learning atmosphere to students along with good placements.
Check their websites for more details.
Good luck.