Surprise visit

My colleaque told me that our PPD paid a surprise visit to school at around 11 am today.
His visit was not noticed by anyone in the school.

My colleague was conducting a class lesson. She spotted the visit. She was panicked and asked all students to be in their classes respectively.

Our PPD toured the block Wawasan floor by floor. Nobody knew about his presence. Nobody aknowledged him. Many classes were without teachers. The students wee loitering outside the classes. It was noisy.

I support such surprise visit to schools. The visit will change the work culture in all schools. The teachers will be more responsible and dedicate.

In fact the school administrators always remind the staff to be in the class in the staff meetings. But it fails to change the teachers indifferent attitude.

Any solutions?