Tā zài quánxiào yǎnjiǎng bǐsài zhōng ná le dìyī míng.
He won first place in the school-wide speech contest.
Tips
usage
演讲 is prepared oratory; 讲话 is more casual. 演讲比赛 (prepared speeches on a theme) is standard from primary school upward; 辩论赛 (debate) is typically high-school and university.
