Can I be late for school due to illness in Australia?

It doesn't matter if you are late because of illness. Teachers generally don't say anything, but they must be honest and explain why. Westerners will believe you at first impression, but if this happens frequently, they will start to question it.

If you are sick and can't come to school, you must show your doctor's certificate, otherwise your attendance will be recorded. It doesn't matter once or twice. If the frequency is high, if the attendance rate is lower than 80%, it will be notified by the immigration bureau, which will bring unnecessary trouble.

Good luck!