The first school (which) I attended was a primary school.

我第一个上的学校是一所国小。

youdao

Kids at the first school, an expensive private academy, got an average of 9.2 hours per week of scheduled, usually rigorous physical education.

第一所学校，是一家昂贵的私立学校，那里平均每周安排孩子们进行9.2小时通常很严格的体育训练。

youdao

The school is the first of its kind in Britain.

这是英国同类学校中最早的一所。

《牛津词典》

Two years ago, it became the first school in the country to join the Confucius Classroom program.

VOA: special.2010.02.04

But he founds the first Russian museum, the first school of navigation, the first school of this and that.

但彼得大帝还修建了俄国第一家博物馆,第一家航运学校,还有很多方面上的"第一所"学校

耶鲁公开课 - 欧洲文明课程节选

And the first year of law school was notorious for being difficult and grinding, you know, it was like that.

法学院的第一年是众所周知的——课程很难，让人难以忍受。

哥伦比亚的氛围 - SpeakingMax英语口语达人

He's spent his last two birthdays, since he started the first school, with these children.

FORBES: Going Global

They were the first school in that state to plant a school garden.

WHITEHOUSE: The First Lady Speaks on the HealthierUS School Challenge

And, in 1985, National Technological University became the first school to offer online degree courses via satellite transmission.

FORBES: Distance Learning Has Been Around Since 1892, You Big MOOC