Aerospace Engineering Scope

IIT Bombay the best engineering colleges of India.
There are so many options after doing B.Tech from IITB.
Clear GATE and go for M.Tech or MS
If you are doing Masters from outside go for PhD (Only if you are getting guide) Check IRCC website. They have job openings. Jobs are not permanent. They have contract jobs from 6 months to 3 years. Starting salary is min 25k per month. You will be working as project associate / assistant.
If you know someone from IIT you could get 89 days project. You will be working under him as project associate / assistant. Here also salary is min 25k. Difference between 89 days and contract is you have to pass interview or sometimes small written test (which will be held for you if you are selected).
And if you complete 3 sets of 89 days then you are not eligible for another set of 89 days project. This is new rule I heard from PhD student. I don't know its confirm news.
Hope this help.

First part of your question depends upon your hard work and professional skills. Second part of your question is that there are many job opportunities for an aerospace engineer. The Indian aerospace industry is growing rapidly and you will most likely be employed in government owned enterprises such as ISRO (Indian Space Research Organisation), DRDO (Defence Research and Development Organisation), HAL (Hindustan Aeronautics Ltd.), NAL (National Aeronautics Labs), etc. Many global airlines operators and aircraft companies are now planning to open their MRO- Maintenance, Repair and Overhaul facilities in India. A lot of prestige is associated with working in these organisations.You could also work for government and private airlines like Air India, Indian Airlines, Jet Airways, Spicejet etc. Job opportunities also exist in civil aviation departments and the Indian Air Force. You can also try organisations like NASA and foreign airlines. All the best.

Human quest for exploring flying and related science and technology is historical and is a big challenge and scientist are still exploring lot of unknown. Aerospace Engineering is niche engineering. In additions to aircraft extensive research is going in the field of avionics, rocket, missiles, spacecraft and UAV. Lot of technology generated in this industry is used by multiple other industries. For example concept of engine computer in aircraft is now adopted in all modern automobiles. I am of the opinion that scope of Aerospace engineering is good. You can easily get jobs in DRDO, ISRO, Aviation industry, Indian Air Force and aircraft production units and its ancillary.