Hello,
Read this:
Results of International Mathematical Olympiad of 2017
China ranked second in International Mathematical Olympiad of 2017
Here is the results of China:
First participation: 1985.
Number of participations: 32.
Gold medals: 147. Silver medals: 33. Bronze medals: 6. Honourable
mentions: 0.
And Republic of Korea ranked first in International Mathematical
Olympiad of 2017
Here is the results of Republic of Korea:
First participation: 1988.
Number of participations: 30.
Gold medals: 70. Silver medals: 67. Bronze medals: 27. Honourable
mentions: 7.
Here is the results of rest of the countries:
https://www.imo-official.org/results.aspx
Thank you,
Amine Moulay Ramdane.