The starting place of teachers should be changed every time.

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3. Moving around the classroom
... Continued from the previous blog.

2) The starting place of teachers should be changed every time.

For example, if you started from the first line at the corridor side for the first time, so you can start from the second line for the second time, and for the third time from the third line and so on...
If you didn't so, the student who was seen first and the student who was seen the end would be fixed all the time.