Immigration risk ratings for countries and providers will be updated on 31 March 2017. These updated ratings will also be reflected in the Document list that student would be required to provide for visa assessment. The risk rating is a measure the Department Of Immigration and Boarder Protection (DIBP) calculates from various data it collects on compliance by previous visa holders, retention rate by providers among other internal measures.
The next update to the immigration risk ratings will occur in September 2017.