Special thanks to MarkBcc168 and jeneva for helping us with the archive.
Official site of the Thailand October and TST camps from 2015-16 onwards.
The MOOTS cloud contains official TST exams for 2016, 2017, and 2019, official October Camp exams for 2017 and 2019, and also some handouts.
Its exams page contains some Thai MO (precursor to TMO) problems from 1989 to 2003.
Its webboard used to be popular with Thai math olympiad campers, and still contains various discussion threads from times past.
The official site for Thailand's national math and science olympiads. Contains the official files (in Thai) of most TMOs
The National Olympiads page also contains some official information about TMO.
Contains some information about Thailand Mock IMOs
Contains competitions hosted at Triam Udom Suksa School from 2003-2009.