Solid growth in numeracy and reading was recorded by a Catholic school in St George in the latest NAPLAN results.
Pupils from St Finbar's Catholic Primary School at Sans Souci impressed in key learning areas.
Principal Susan Bonello says the school's mathematical expertise and excellence program whereby staff plan, collaborate, support and provide feedback, was crucial to the positive outcome.
"We continue to foster a learning environment that favours self-improvement and empowerment so that all our students are able to achieve their best in all areas of the curriculum," she said.
Former Sydney Catholic Schools executive director, who retired after Easter, congratulated teachers on their commitment in lifting literacy and numeracy standards across the Archdiocese.
Hurstville Adventist School also excelled in the 2018 NAPLAN National Report.
"The report confirms that since 2008 there have been statistically significant gains in several domains and year levels, particularly at the primary school level," ACARA chief executive, David de Carvalho, said.
The performance of Australian students in Years 5 and 9 - numeracy, Years 3 and 5 - reading, Years 3 and 5 - spelling, and Years 3 and 7 - grammar was significantly above the NAPLAN 2008 average.
The writing test results in Years 5, 7 and 9 were below those observed in the base year (2011).
Compared with 2017 results, there were no statistically significant changes in any of the NAPLAN test domains.