GMAT

Dear Roopesh,
You do not need to take GMAT exam for admission in an Australian University for MBA, you need to take your IELTS and get an overall score of 6.5 with no band less than 6. You will need a pass percentage of above 65% in your UG and the exact cut off will depend on the university in which you are applying. Some may also require you to have a work experience of at least 3 years after your studies. However, the majority of the universities offer an MBA for overseas students (fresher) so the work experience should not be a problem. Please ensure that you enrol in a 2-year course and not for a 1-year course as you will not be eligible for a post study work visa and later for PR in the case of the 1-year course. Keep this in mind and do not get misled.
All the best.

You're required to have minimum 12 years of primary and secondary education and should have Senior Secondary Certificate of Education or an equivalent certificate from India.
You should apply to your desired universities. The university courses in Australia usually begin from early March so make sure that you start with the course and university searching a good 12-15 months prior to the submission of application forms.
Its recommended that application forms be submitted 8-12 months prior to the closing date of acceptance of application forms. Students have an option to download and print the application form from the university's official website and use it as a regular hard copied form.
Students must possess good English language skills and for that purpose are required to take an IELTS exam, which is the only English proficiency exam accepted by the Australian Department of Immigration and Citizenship.