Here are all the necessary study materials you will need to prepare for the Olympiad.

International Linguistics Olympiad(IOL)

IOL-2019-Problems 
IOL-2019-Solution
IOL-2021-Problems
IOL-2021-Solution
IOL-2022-Problems
IOL-2022-Solution
IOL-2023-Problems
IOL-2023-Solution

 

Asia Pacific Linguistics Olympiad(APLO)

APLO-2019-Problems
APLO-2019-Solution
APLO-2020-Problems
APLO-2020-Solution
APLO-2021-Problems
APLO-2021-Solution
APLO-2022-Problems
APLO-2022-Solution
APLO-2023-Problems
APLO-2023-Solution

Artificial Intelligenec Olympiad(IOAI)

The Artificial Intelligence Olympiad is happening for the first time at an international level so we do not have any past papers. 
Here is a guide on how to prepare for the Artificial Intelligence Olympiad (IOAI).