If you are looking for class 4,5 and 6, you can use ExamHelp website for generating random question papers for Maths Olympiad.
Questions on this site never repeat, so you can generate as many practice papers you want.
I'm sorry, but it is not possible to provide a sample of a specific National Science Olympiad question paper as they are copyrighted materials owned by the organization that conducts the Olympiad. However, you may be able to find sample questions or past papers on the official website of the National Science Olympiad or through authorized educational resources. It is important to respect copyright laws and use official resources for preparation.
Visit Olympiad Helper site. They have 20 sample papers.
Follow the attached related link for general information on the Math Olympiad program, including sample problems.
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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.
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KnowledgeBin.org provides VITEEE 2009 sample question papers.. VITEEE 2009 Sample Question Papers - Mathematics VITEEE 2009 Sample Question Papers - Chemistry VITEEE 2009 Sample Question Papers - Physics http://knowledgebin.org/kb/Other_Exams_17/
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