She said many international students who came here were not genuine students and education was not the primary motive.
"Many come with a clear migration agenda - choosing the cheapest possible course and finding jobs in 'no future' careers in New Zealand just to gain residence," said Ms Ranson.
"Too many, often from India, are being 'sold' student visas by unlicensed so-called education advisers based on low-level courses with the promise of subsequent residence status being easily obtained or almost automatic."
The number of applicants being declined a student visa last year was 17,564 from 116,582 applications, up from 6298 the previous year when there were 93,544 applications.
The total number of international students over the period increased 16 per cent from the previous year, which was also the second year-on-year increase. China remained the largest source country of international students on 27 per cent, followed by India on 23 per cent and South Korea on 6 per cent.
The failings of New Zealand's policy will be discussed at a panel session called "Hitting the reset button on international students". The panel will include Immigration's education relationship manager Celia Coombes, Education New Zealand general manager Peter Bull and NZAMI representatives. It will discuss tighter controls, policy and whether New Zealand is being promoted to international students fairly.