on the school非固定搭配，有篇小說叫The Wheel on the School 《學校屋頂上的輪子》

“在學校”常用固定搭配是at the school和in the school，差別不太大，基本可以互換。

at school和in the school有什麼區別

at school和in the school的區別：at school在學校（指學生在學校求學），相當於in school；in the school在學校（指在學校內任職，比如老師等），是特指某一所學校，相當於at the school。

一、at school

釋義：在學校，在上課，在求學

例句：

1.He was disciplined at school for talking back to the teacher.

他因為和教師頂嘴受到了處分。

2.Each child had participated in extracurricular activities at school.

每個孩子都參加了學校的課外活動。

3.Her class teacher made a special arrangement to discuss her progress at school once a month.

她班上的老師作了特別安排，每月討論一次她在學業上的進展情況。

二、in the school

釋義：在學校，在這所學校

例句：

1.The pupils assembled in the school hall.

學生在學校禮堂集合。

2.He was the only boy in the school who was known by his Christian name and not his surname.

他是學校裡唯一一個被稱呼洗禮名而不是姓氏的男孩兒。

3.She is considered the best in the school.

全校數她功課好。