Focusing on the important things, is a recommended classroom rule. The students are advised to keep their focus on all important things. They should not get distracted to anything other than study. Focus is the important factor of study.
The classroom, therefore, prioritizes it as an essential classroom rule. The students are made to learn how to concentrate and focus on things in the classroom.
Loss of concentration is the loss of study. It renders overall education being an ineffective. Therefore, all the students are required to keep their focus on all things that are being taught in the classroom.
This is an important classroom rule. The students should focus on all the things that are being taught by the class teacher. Alternatively, the class teacher is mandated to keep an eye over the behavior of student to maintain the discipline and decorum in the classroom.