Canada

You can talk to your seniors or your faculty regarding this. They will definitely help you out in this. you can also consider going to any admission consultant for this but going to your teacher/senior will be a better option.

You can work over there and then can also ask for permanent residence-ship there. In India, you can work in a hospital or practice on your own.

You have an option of scholarships as you are going for Masters course. Both of these countries have their own specializations depending on which course you are opting for.

Aerospace engineering is one of the best sectors in engineering. You can work for NASA or any other space agencies. You can also work as an aircraft engineer, satellite engineer or can go for the astronaut selection program after gaining some experience. There is a huge scope too if you are interested in the field of research.

Yes, you can. You will have to provide all academic mark sheets including 12th and graduation.

Hello Ravinder, well Canada colleges do not really follow a ranking system. Both the colleges you mentioned which I believe are Fraser International College and International College of Manitoba are good ones. Zero in your choice basis the expenses, university tie-ups ( a number of colleges have tie-ups with top universities and have transfer provisions among these), co-op education, internship opportunities, climatic conditions and so on. Winnipeg where ICM is located is one of the coldest places in Canada!

If you are talking about student visa, you must first get the admission offer from a university. In addition to IELTS scores, you must check the academic requirements. As far as your IELTS is concerned, it is quite low. Can you mention your academic details and what you want to study, etc.?

Yes, you can get visa for Canada. The gap will not matter.

You should improve your IELTS score as you would be applying for post-graduation and minimum bands requirement for that is 6.5 overall not less than 6 in any module. There are many good colleges in Canada like:
1. Humber.
2. Cenntennial.
3. Sheridan and many more.
Your percentage is low, so make sure you have your IELTS score as a plus point.

Your IELTS score is too low. Yes, you can reappear for IELTS and your percentage in class 12th is fine. You should definitely not apply for visa with 5 bands.
Good luck.