Meaning of gāo zhōng:
gāo zhōng
高中
Noun
senior high school; abbr. for 高級中學|高级中学[gao1 ji2 zhong1 xue2]; to pass brilliantly (used in congratulatory fashion)
Wǒ de mèimei jīnnián shàng gāozhōng.
我的妹妹今年上高中。
My younger sister is attending senior high school this year.
Tā zài gāozhōng shí cānjiāle hěn duō bǐsài.
他在高中时参加了很多比赛。
He participated in many competitions during high school.
Zhùhè nǐ kǎoshì gāozhòng.
祝贺你考试高中。
Congratulations on passing your exam brilliantly.