Find some of my reports, answer sheets and certificates for recent competitions in this repository. Please email me at aditya.ramdasi16@gmail.com if the pdfs aren't rendering for your browser.
More about International Astronomy and Astrophysics Competition (IAAC) here - https://iaac.space/en/#iaac
More about International Youth Math Challenge (IYMC) here - https://iymc.info/en/#whatis