The Australian Greens say the Abbott Government must immediately rule out a cutting all Federal funding for public schools, as proposed in the Federation Green Paper leaked today.

Spokesperson for Schools Senator Penny Wright said the Federal Government has an essential role to play in school education.

"The Australian Greens are calling on the Abbott Government to immediately rule out walking away from public education," Senator Wright said.

"It is the government's job to govern for all - they must not abandon the 2 million Australian children in public schools.

Students at rich schools ready to switch to online NAPLAN testing faster could receive higher marks, Australian Greens spokesperson for schools Senator Penny Wright has revealed.

The administrative agency ACARA has told Senate Estimates the new adaptive testing method could lead to higher scores and it would consider bulk-adjusting scores if necessary.

Senator Wright said adaptive testing would ease the stress of NAPLAN testing by adjusting to student capabilities, but warned less well-resourced schools might be left behind.

Statement from Senator Penny Wright, Australian Greens spokesperson for Schools:

"This government is trying to use tricky accounting to hide their broken promises on school funding and disability loadings," Senator Wright said.

"The Abbott Government promised a full disability loading this year - but instead they are continuing with a completely inadequate model which has left 100,000 students with a disability without any educational support at all.