USA

You need to qualify MCAT entrance exam.

Aerospace engineering has good scope in India particularly because if Make in India initiative. Job opportunities for aerospace engineering graduates are available in ISRO, DRDO, aeronautical engineering manufacturing companies such as HAL, Aircraft component design & manufacturing ancillary units, IAF, R&D outsourcing companies, IT companies & academics etc.

Hi,
You need to take the SAT & TOEFL tests in order to apply and receive admission to US colleges/universities.

MS in finance or Masters in finance is the most suitable course. You may pursue from USA. To know more details and procedures, kindly visit the respective websites of universities in USA or https://shiksha.com/Courses/MS Finance/USA. All the best.

Unlike India, MBA specialization options in USA are numerous. If you keep in mind your interest areas and you pick up the right discipline you do stand a very good chance of doing well on the career front in US. However, if you want to complete MBA in US and then come to India to seek employment then you would be at a disadvantage compared to Indian students as they have the advantage of campus placement drives at their respective institutes.

If you pursue MBA from the respective countries then you do have a good chance to seek employment. A good career is dependent on many other factors apart from seeking an MBA.
However, if you have done MBA in general management from India then job opportunities in USA/Ireland would be bleak for you.

No, you cannot get admission. You should reappear for the IELTS test.

Kindly, check ets.org for GRE test, you will find the dates on the website itself. Almost all the universities require GRE score for Masters. You can check the GRE requirements on their websites.