The Singapore Mathematical Olympiad (SMO) is the largest and oldest mathematics competition in Singapore. It started as the Inter-School Mathematical Competition in the mid-1950. It was renamed Singapore Secondary Schools Mathematics Competitions (for the Secondary Section) and the Singapore Mathematical Olympiad from the late 1980’s. The current name Singapore Mathematical Olympiads (Junior, Senior and Open) started in 1995.
Download SMO past papers 2023 PDF problems with answers and solutions. Junior Section, Senior Section and Open Section, First Round, Round 2.