About Astro Coach
One place to train for astronomy olympiads.
Past papers are scattered across old PDFs, answer keys rarely explain anything, and there's no easy way to see which topics you're weak in. Astro Coach puts real questions, real explanations and your progress in one place.
Real past questions
Multiple-choice and free-response problems from past USAAAO, IAAC and BAAO papers — not made-up practice sets.
Progress you can see
Your accuracy, badges and missed questions on one dashboard — plus streaks and topic strengths with Pro — so you always know what to practice next.
Feedback that teaches
Every multiple-choice answer is explained. Free-response work is graded part by part against the official marking scheme.
Where the questions come from
Every question comes from a past competition paper and is labelled with its source: competition, year, round and question number, with a link back to the original where one exists.
Multiple-choice explanations are written by Astro Coach. Free-response solutions are labelled as official, adapted from the official one, or written by us.
Independent
Astro Coach is an independent educational project. It is not affiliated with, endorsed by or run by USAAAO, IAAC, BAAO, IOAA, IAO, Science Olympiad or any other competition organization. Competition names belong to their organizers.
Common questions
Is it free?
Yes. Every multiple-choice question, the olympiad guide and your progress dashboard are free. Astro Coach Pro adds the full free-response bank and AI grading.
Who is it for?
High school students preparing for astronomy olympiads — from a first online contest to national rounds. The olympiad guide ranks 9 competitions by difficulty to help you choose.
Is the AI grading reliable?
It grades against the competition's own marking scheme, one part at a time, and explains each score. Treat it like a strict study partner, not an official result.
Contact, corrections and takedowns
Found a wrong answer? Use "Report a problem" on any question. Represent a competition and want something credited differently or removed? Email us and we'll act on it promptly.