MBA/PGDM

Around 65 percentile.

You can give other exams like CAT. Also different universities conduct their own entrance exams like snap etc

Anyone with a Bachelors degree is eligible to do MBA and age doesn't matter.

Go through the syllabus once and pick your strong areas. You don't have to cover the whole syllabus. Keep practising mocks as much as possible. Have a look at the last year paper to get the idea about the type of questions asked. Work on your time management skills. Be consistent with your practice and you will be good to go.

The should go for CAT XAT NMAT (For Narsee Monjee). These are the tests accepted by the top colleges and universities.

Yes, you can try for jobs abroad. It will depend upon your knowledge and skill Sets.

If you are planning to do your MBA from abroad like Canada or north America then you have to give IELTS as the top universities require that.

Yes, you can do MBA from US. But it'll be very costly. You can also search free education in Italy and Germany MBA. They give free education to Indians.

Here are the few colleges
FMS, Delhi
DSE, Delhi
USMS.

Here is the list of colleges-
London Business School
HEC Paris
MIT Sloan School of Management
IE Business School
Stanford University
Harvard University
Kellogg School of Business
Columbia Business School.