Hi Ankit l am new to this forum however l am an Australian expat currently living and working overseas. lf you decide to work overseas make sure you get a statement from the Tax office that you are a "non resident for taxation purposes". Your tax liability depends greatly if you deemed to be a non resident or not.
As a non resident of Australia you have to submit a tax return for every dollar earn't in Australia and it will be taxed at the highest marginal tax rate. l suggest you find a good accountant who deals specifically with Expats.

Regards
Garry