To work in a school as a teacher aide or LSO in New South Wales, you will first need to complete a qualification such as the CHC30221 Certificate III in School Based Education Support or the CHC40221 Certificate IV in School Based Education Support. These are the two qualifications that all schools in New South Wales require.
A popular option is ITAC’s Teacher Aide Combo. This program provides maximum employment prospects because graduates have more skills and knowledge than someone who has only completed a single qualification. The combo saves time and money and is the only genuine 'combo' available in Australia (i.e. it combins all units together as opposed to studying them unit-by-unit). To learn more about how to become a teacher aide in NSW we recommend reading this detailed article on the topic.