Ms O'Donoghue said education agents were part of the problem, as their loyalties lay with the institutions - primarily private providers - to boost numbers, rather than with the students.

''I have often found they've gone through an education agent to get the college in the first place but the education agent may not be looking at what will suit that particular individual, rather the colleges they represent. They may be doing courses that are totally inappropriate for them.

''Foreign students are worth quite a lot of money to the Australian economy and they should be rethinking whether if certain people are doing certain courses, whether they are suited to those courses.''

The government has focused attention on foreign students since the Knight review recommended tightening visa requirements. Discouraging people using study as a stepping stone to migration was a key to the government's response to the report in September.

The Immigration Department has cracked down on those not meeting their student requirements. More than 15,000 student visas were cancelled in 2010-2011, up from 9500 the previous year. The department said the figures included those ''who had departed Australia and no longer had active enrolment, however still had long validity on their visas''. The Migration Review Tribunal recorded increases in rejection of student visa requests.