Sometimes students are interviewed by the colleges and Universities prior to issuing Offer Letter.
These interviews are conducted to assess if:
the person is a genuine applicant,
they can meet all their expenses while in Australia, and
they intend to return to their home country.
In addition, applicants may also be interviewed by the Australian High Commission to assess if they are genuine in their intention to travel to Australia before the visa is granted.
Since it is crucial that applicants pass both these interviews, they need to be well-prepared to confidently face these interviews so that the visa is granted.