I’m moving to Australia in July 2026, can I start year 11 in semester 2?

I (15F, born in April) will be moving to Australia in July. I am currently in the 10th grade and our school year will officially end in May but our graduation is in June.

I don’t know if I have to be held back and enter 10th grade again. Can I start year 11 in July?

Can someone explain the education system?

Side note, in my country, most public and private schools end their academic year in march. However, I enter a science high-school. Should I consider moving schools if it helps my case?