Helpful Resources
Here are some great resources that will help you in your astronomy journey.
A guide to advanced concepts within the Astronomy & Astrophysics Olympiad, compiled by instructors across three continents.
The official syllabus from the IOAA. The contents of the NZOAA as well as the IOAA will be based on this.
Past exams of the IOAA can be found here. They are a good representation of what future exams will look like.