每年，國際數學奧林匹克香港委員會均於五月或六月舉辦一次選拔初賽。比賽時間一般為 3 小時，設 20 題，參賽者只需提供答案。在選拔初賽表現突出的同學將獲邀參加為期一年的訓練，從中選出參加 IMO 的香港代表。

Each year, the IMOHKC organises a preliminary selection contest in May or June. The contest normally lasts for 3 hours and contestants have to solve about 20 problems which require answers only. High achievers of the contest are then invited to take part in a year-long training programme which selects the Hong Kong team for the IMO. 

2002 problems solutions

2003 problems solutions

2004 problems solutions

2005 problems solutions

2006 problems solutions

2007 problems solutions

2008 problems solutions

2009 problems solutions

2010 problems solutions

2011 problems solutions

2012 problems solutions

2013 problems solutions

2014 problems solutions

2015 problems solutions

2016 problems solutions

2017 problems solutions

2018 problems solutions

2019 problems solutions

2020 problems solutions

2021 problems solutions

2022 problems solutions

2023 problems solutions

2024 problems solutions

為期一年的訓練中設有幾次選拔測驗，以挑選 IMO 代表隊的成員。其中兩次測驗為於十一月或十二月舉行的中國香港數學奧林匹克（CHKMO）及於翌年三月舉行的亞太區數學奧林匹克（APMO）。 

During the year-long training programme, several tests are administered and the results from these tests will be used to select the Hong Kong team to IMO. These include the CHKMO in November or December and the APMO in March.

1997-2023 selection tests (excluding CHKMO and APMO) problems solutions

1998-2022 CHKMO problems solutions

APMO