People often left the regions as soon as they had those points. There should be regulations that make them stay and invest for at least five years, he said.
The extra points required will not put the bar too high.
"If you have come to the country and worked five years, and have English (language) then you should be able to get it," Mr Prasad said.
Compulsory English language tests are a good idea for migrants. Understanding the language stops them being exploited by employers, because they will know their rights.
The new measures also put a two-year ban on children getting residency for their parents. Supporting the parents of migrants has been costing Government $10 million a year.
Mr Prasad said some migrants exploited their parents, using them to look after children and not passing benefit money on to them.
"If you can't look after your parents then you should also go back to your country."
Immigration staff should interview parents separately, to make sure they are not being exploited. And the parents also need a good grasp of English language, Mr Prasad said.
"I think they should learn the culture of the country."