China Team Selection Test
The China Team Selection Test (CTST) is part of the process used to select and prepare China’s team for the International Mathematical Olympiad.
CTST problems are known for their depth and technical difficulty. They often demand several connected observations rather than a single standard technique, making the papers valuable for studying high-level problem-solving and complete proof construction.
This section stores CTST papers by year, together with solutions, failed approaches, and summaries of the central ideas.
Papers added to the ctst directory appear below automatically.