A Sydney teenager been left with serious burns to his body after setting fire to his HSC notes.

The 18-year-old had to be flown to hospital after receiving multiple burns to his upper and lower body after torching "piles" of the school study notes at a semirural property in Sydney's north-west.

Emergency services were called to the property in Arcadia on Thursday morning.

A CareFlight rescue helicopter treated the teen as other emergency services arrived at the scene.

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He was flown to Royal North Shore Hospital in a stable condition and in "good spirits".

NSW Ambulance Inspector Jenny Potter told The Sydney Morning Herald the teen added fuel to a bin and set it alight.

She said burning notes was not a wise way to celebrate.

HSC results were delivered to thousands of students across the state this morning.