They contain harshly difficult mathematical problems which require you to think 'outside the box'.
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Just go on site sofworld.org
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.
Disha publication books for olympiad exams might help you if you are looking for class 8th olympiad books.
You can download papers with answers on google just type in Jumior Maths Olympiad Papers
by answering all questions correctly!