According to an analysis released by the NSW Teachers Federation on Thursday, Penrith’s Cranebrook High School, Mount Druitt’s Chifley College and Campbelltown Performing Arts High School in Sydney’s west will each lose more than $1.2 million apiece in funding in 2018 and 2019.

A staggering $26 million would be also stripped from schools in the electorate of New England, in the state’s northwest, according to the list detailing the impact on 2000 schools.

The analysis – which is based on data obtained under freedom of information laws from the NSW Education Department – is the latest chapter in the state and Commonwealth funding wars triggered by Gonski 2.0.

“This school-by-school data shows the reality behind the deceit of the Turnbull plan,” the federation’s acting president, Gary Zadkovich, said.

In an unprecedented move, NSW Education Department secretary Mark Scott wrote to every public school principal in the state shortly after the analysis was released on Thursday.

“I am aware the Commonwealth education minister has written to you with an estimate of the funding increases that your school will attract from the latest announcement,” the letter states.

“You should not rely on these figures for future planning or budgeting purposes.”

The federal budget contains an increase of $820 million to NSW schools, he said.

However, he said there remained a shortfall compared to the existing Gonski 1.0 agreement of $1.8 billion up to 2021.

The Berejiklian government has insisted it will continue to fight to secure the original funding, with legal options being considered.

SCHOOLS TO LOSE FUNDING IN 2018 AND 2019:

• SOUTH-WEST SYDNEY: Campbelltown Performing Arts High School -$1,276,547; Narellan Vale Public School – $652,249
• PENRITH: Cranebrook High School -$1,225,357; Braddock Public School – $542, 319
• NORTH SHORE: Willoughby Girls High -$624,350
• NEWCASTLE: Merewether High School -$540, 451
• LISMORE: Lismore Public School -$457,662
• NEW ENGLAND: Hillvue Public School -$1,473,839; Armidale High School -$538,715Source: NSW Teachers Federation.