at first, it was held randomly;
but since the World War II, the Chess olympiad has been held at a time interval of every 2 years.
Chat with our AI personalities
Disha publication books for olympiad exams might help you if you are looking for class 8th olympiad books.
nowhere
50
You can prepare for Maths and Science Olympiad by logging / taking subscription in the Reflective Learn website. They provide sample and model test paper and prepare you to competitive exams like NSO, IMO and other Olympiad exams.
Follow the attached related link for general information on the Math Olympiad program, including sample problems.