How can we amend a tourist visa to dependent for international student while the spouse is inside Australia?


Answers:   
It is impossible to change a Tourist visa to anything else as Tourist visas are issued only to people whose sole intention is to holiday within Australia.
The International student should apply for a dependent visa before he/she enters Australia and if granted, you may be able to conduct the student from outside Australia if all conditions are fulfulled.
It's not possible to give any more detailed information in need knowledge of your respective passport countries and type of course.

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