Photo: © 2010 AP via AAP/Damian Dovarganes

A principal in Queensland alerted authorities to one leak last week, and there are calls in Western Australia for an inquiry into claims schools are cheating by opening their tests early.

"If people have gone as far as to put this information out to students or teach those particular tests, well then it completely undermines the purpose of the testing regime," Dave Kelly from WA's State School Teachers Union told the ABC.

A number of parents have complained that schools are suddenly trying to lump their children into the special needs category in a last minute attempt to stop them taking part and bringing down their school's score. 

A Melbourne father has complained that his young son was asked by his school not to attend the testing because he was a "struggler".

"At 12.30pm yesterday, they all of a sudden rang my wife and said he should have an assessment [for special needs] and possibly a teacher's aide. You'd think that should have happened at the start of the year," he told the Herald Sun.