Thailand is devout to the children very punctual. But do not walk out of a classroom right without the permission of the teacher. It is considered bad manners of Thailand.
Best Thai boys are not very punctual, but not whether the right leave classrooms without permission from a teacher. Because it is considered bad manners of Thai.
The children are not very serious, but the time is not right walked out from classroom without permission of a teacher because it is a free Thai manners.