Please provide me the list of shops from where I can procure previous 5-year papers of ICSO / NSO / IMO / IEO?

the physical format of IMO, NSO and IEO Olympiad previous year papers are available on www.mtg.in, Amazon, Flipkart and other Web Portals. You can check the availability in your nearest book store https://mtg.in/mtg-in-your-city/