Hey Rutuja,

These are great questions and I'll try and answer all your questions as systematically as possible. Both scholarships and university applications depend upon your overall profile. Factors such as your Statement of Purpose, Letters of recommendation, Certifications, Social work, etc. along with your scores, play a major role in your application.
Being an 'undecided major' allows you to enter your chosen college without declaring a major and thus, allows you to explore your interests. Your SOP is what sets your profile apart from the other applicants'. Therefore, it's a highly important aspect.
Since the IELTS exam is more widely accepted, you can definitely try taking it. However, it still largely depends upon the country you choose.

In order to make an exact analysis, we'd need your exam scores and other details. But depending upon the program and university you choose, as long as you have a solid profile overall you can definitely get into top universities. If you need help choosing the right program/university based on your scores and preferences, you can always contact us or register with us. Hope the answer helped!

Hey Prateek,
Yes, It is possible to study in the U.S without giving your GRE exams. As a matter of fact, here are the top universities in the united states that don't require your GRE scores for you get admission into:

1. Columbia University
2. Massachusetts Institute of Technology (MIT)
3. University of California, Berkeley
4. Alabama A&M University
5. Central Michigan University
   iSchoolConnect's blog(https://ischoolconnect.com/blog/us-schools-without-gre/) has a detailed list of colleges that don't require GRE exams. Do check them out.

I think it's important to make notes
Even if it's minimal
It helps you keep track of the structure

Originally, Ivy League was an athletic conference – a group of 8 private colleges in North America known for having super-competitive sports teams.
Now, the reputation of these colleges goes beyond sports. They are centers of academic teaching and excellence, research, and have become known for providing promising career futures to all their students.

I have a few tips you should definitely keep in mind-

1. Use the most acceptable fonts – Times New Roman, Arial, Calibri, Georgia, Verdana. Don’t stray away from these in an attempt to make your letter look super-fancy.
2. Use a minimum font size of 12.
3. Leave a 1-inch margin all around the letter.
4. Add a header of your institution or organization.
   Read more here

You have a great profile and might even have a chance at some of the top Aeronautical Engineering schools in the world-
Massachusetts Institute of Technology (MIT), USA
Stanford University, USA
University of Cambridge, UK
Harvard University, USA
Delft University of Technology, the Netherlands
University of California, Berkeley, USA
Imperial College London, UK
University of Oxford, UK
Politecnico di Milano, Italy
University of Michigan – Ann Arbor

The average Columbia University tuition fee is-
Average tuition: $61,850
But it will change depending on which course and which degree you want to pursue

There are three important factors to consider when you’re choosing a recommender-

1. How long you have known them
2. What they have worked on with you, and
3. Their qualifications
   Read more about each of these factors here

The Ivy League University list has some of the most elite universities in the US-
Harvard
Princeton
Pennsylvania
Yale
Cornell
Columbia, and more

The amount will change depending on which country, university, and subjects you choose to study.
As for US, the Aeronautical Engineering fee can be anywhere between-
25,000 USD to about 55,000 USD

It does
But it's a coeducational undergraduate college with graduate schools of business, engineering, and medicine
Which means you'll have to take combined bachelors+masters courses
You can't just do masters directly

Aeronautical engineering is actually a subset of Aerospace engineering
Aerospace engineers specialize in aircraft, spacecraft, satellites, missiles, and weapons systems.
But Aeronautical engineers specialize in all kinds of aircrafts.

Have a few standard points to cover, including-

1. Have a grand opening
2. Talk about your future plans
3. Stress on your experience
4. Share your academic interests
5. Mention a few co-curricular activities
6. Talk about the university

Read about each point in detail here