How does the rain class know that the teacher checks online monitoring?

By checking whether the computer camera is turned on.

Teachers can check the online invigilation option in the publishing settings. If the teacher in Rain classroom does not choose online invigilation, the computer camera will not be turned on.

Because if you don't choose the invigilation mode, there is no screen capture number in the test paper.

Rain classroom has built an online virtual interactive space for all users, or a virtual online school. In this virtual school, there are many online multimedia classrooms for students to use. According to different needs, different courses are offered in these classrooms every day.