Prime Minister Julia Gillard has unveiled changes to the Government's My School website that she says will give parents more information about their child's school and academic performance.

The website, which was launched earlier this year, publishes the results of national student testing and other information about schools.

Its launch was vigorously opposed by teachers who feared it would be used to create 'league tables'.

However it proved to be a hit with parents, with the site crashing several times on the first day it went live.

Ms Gillard says the updated website, which she dubbed 'My School 2.0', will include new information about school finances and now has a more accurate way of calculating a school's socio-economic rating, which enables parents to compare their school's performance with similar schools.

She says the website will also include new security features aimed at preventing the creation of league tables.

"We are now at the stage that we've had three rounds of national testing," she said.

"For the first time, My School is able to include data on the growth of student achievement, because kids that have sat an earlier test have now sat another national test.

"This is an important set of new data for Australian parents, for teachers and for the Australian community."

Ms Gillard says about 2.5 million Australians have visited the site.

The changes are not due to go live until next month.