Typical jobs which students and working holiday makers do are in these industries:
Hospitality (cafes, bars & restaurants): kitchen hand (preparing food and/or washing dishes), waiter/waitress, barista (making coffee), cashier, food delivery, bar staff
Retail/Sales: Shop assistant, supermarket worker
Agriculture/Farming: Fruit picking and farm work (working holiday makers)
Construction: Labourer (on a building site)
Other: Cleaner, traffic control, factory worker