First, basic personal information and relationship documentation is definitely needed (it is strongly recommended that you do it with the help of a professional consultant), and then you need to prepare the security deposit.
With regard to the security deposit of foreign students dealing with spouses and accompanying students, the Immigration Board generally requires the applicant to provide:
The main visa applicant's living expenses and tuition fees during the study period. If the principal, deputy applicant together to submit the visa, then, that is: tuition costs of living spouses living on both sides of the ticket;
If one gets a visa and after studying in Australia for a certain amount of time, the other needs to be added, then it needs to be provided: for the remainder of the visa period, both parties' living expenses and the remaining tuition fees.
The source of the security deposit can be the applicant himself, the spouse itself, or the parent or mother who holds the principal student signatory.
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