IOAA AND IOA

The International Olympiad on Astronomy and Astrophysics is an international competition for high-school students along the lines of the other International Science Olympiads, covering the fields of Astronomy and Astrophysics.
This is the official syllabus http://www.ioaastrophysics.org/syllabus/.
This is the official site for past year problems and more http://www.ioaastrophysics.org/

Note that the IOA is different from the IOAA and IOA if for junior students whereas the IOAA is for the senior students.

This olympiad requires a strong base in physics and mathematics and the following books are preferred:- these contain both astronomy and physics books:-

• "Fundamental Astronomy" by H. Karttunen, P. Kröger, H. Oja, M. Poutanen, Karl J. Donner
• "Astronomy: Principles and Practice" by A.E Roy and D. Clarke
• "Astronomy: Structure of the Universe" by A.E Roy and D. Clarke
• "The Physical Universe" by Frank Shu
• "An Introduction to Modern Astrophysics" by Bradley W. Carrol and Dale A. Ostile
• "Astronomy: A Physical Perspective" by Marc L. Kutner
• "Schaum’s Outline of Astronomy" by Stacey Palen
• "Universe" by Roger A. Freedman and William J. Kaufmann III
• "Fundamentals of Physics" by Robert Resnick, Jearl Walker, David Halliday
• "An Introduction to Mechanics" by Kleppner and Kolenkow
• "Physics" by John D. Cutnell, Kenneth W. Johnson

All the Best!