Translation of "Competitions" in Japanese

Started doing science competitions,

そこから科学コンテストや

And yet, in the "real adult world" there are a lot of competitions.

だが、「実際の大人の世界」では、競争はたくさんある。

In Olympic competitions, a gold medal is for first place, a silver medal for second, and a bronze medal is for third place.

オリンピックでは金メダルが１位、銀メダルが２位、銅メダルが３位だ。