What is the ruling on a teacher collecting money from students—as a fine for absence—and distributing it among the high-achieving students, and what is the ruling on the teacher adding money from himself to this fund?

It is not permissible for a teacher to impose a fine on absent students, whether the money is placed in the school, given as charity, or awarded to outstanding students. This is because it constitutes financial chastisement, which is prohibited according to the majority of scholars. Those who permit it do so only for those with the authority to impose chastisement, such as the Imam or a judge, not for a teacher. The fundamental principle is the inviolability of a Muslim's property.