Now test preparation is a synonym for examination classes, test, examination.

备考是考试课的同义词，测试是考试的同义词。

In fact, in school sometimes teachers will say, " Time's up" or " Your time is up" when they are giving an examination, a test, to their students.

事实上，在学校里，有时老师在给学生考试时会说“时间到了”或“你的时间到了”。