secondary school 的意思是“中学”，用于英国英语，与美国英语的 high school 同义。既然可以说 junior high school, senior high school，当然也可以说 junior secondary school, senior secondary school。如：

We started taking French in junior secondary school. 我念初中的时候开始学法语。

Entrance to universities and senior secondary schools was restricted. 进入大学或高中的资格受到限制。