Bachelors

One sitting degrees are banned. A candidate can pursue one-year additional degree course after completing his or her graduation. South Indian universities offer such courses.

Go for USA, that's better.

To be on the safer side, score 70% and above. The minimum criteria for colleges is generally 60%.

You can get admission in the University of Florida. It will cost you around 12 lakh rupees.

Hi Aditya, most IELTS coaching materials are available online. A number of audio video books are also available. You may or may not take a coaching. It is upto you. Enrolling into coaching will help you communicate face to face in English with your teachers and batch-mates which may not be possible in an online home class. So it is upto you to decide.

Hi, you can check if admission are open here
http://www.latrobe.edu.au/study/how-to-apply/important-deadlines
Certain courses will allow you to apply but will be difficult as you are an international student.
Happy Birthday in advance.

Did you complete your B.Tech in mechanical engineering?