St Clair High School staged a stunning turnaround in the secondary schools’ state boccia decider, clawing back from the brink to beat defending champions Wagga Wagga High School.

The Western Sydney school snatched a 5-4 win, recovering from 0-4 down in the grand final to get the job done after an extra end.

Kincumber High School finished third in a tightly contested division.

In the primary schools’ final, Arcadia Vale Public School took out top place, with Orange Public School runner-up and Kellyville Ridge Public School third.

The Championships are the culmination of a season that began with more than 700 schools and around 3,600 students and 1,200 staff taking part across 28 regional venues.

The primary field was whittled down to 28 schools and the secondary field to 24 for finals day, all chasing state glory at Olympic Park.

The NSW Department of Education’s School Sport Unit Disability Inclusion Officer Peter Cardy (who works with fellow Inclusion Officer, Anthony Moyes) said Tuesday's primary finals delivered plenty of standout moments, with schools travelling from as far as Lismore, Boggabri, Griffith and Broken Hill.

He singled out Springdale Heights Public School, competing for the first time and finishing fourth, and highlighted the extraordinary community effort behind some of the travelling schools - including Broken Hill High School, which raised $20,000 to fund its trip, and Oxley High School, which raises around $8,000 annually to bring its team to Sydney.

Among the schools making the trip for the first time was Bundeena Public School, which finished equal 13th in the primary division; a solid debut result for the small school.

Boccia Australia President, Richard Boele, praised the scale and depth of the NSW schools’ pathway, describing it as unmatched anywhere in the country.

"NSW is leading Australia in terms of bringing boccia into schools," he said.

"When you have the sport in schools, that's when you're getting the potential Paralympians early enough for them to be winning medals at the Paralympics."

Boele pointed to the rise of the Wagga Boccia Crows in the club competition as a direct product of the schools' tournament and praised the department's team for the energy they bring to expanding access across the state.

"We can't reach into every part of regional NSW, or even across Sydney, without the schools’ competition," he said.

The tournament's talent pipeline is well established. Reigning world Pairs champions and Paralympic silver medallists Dan Michel and Jamieson Leeson both began their boccia careers in this exact competition, with Leeson returning this year to present medals to the new champions.