Hey mate ❤❤I am in class 6 but i know there is NSO on 27TH november.For PREPARATION I have TWO books .. One of them is a WORKBOOK. The other one is a EXPLANATION book named OLYMPIAD CHAMPS.U can buy them as it is very nice explained all the topics .In the internet u can buy previous years papers...HOPE IT HELPS ✔✔✔❤❤
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