Make the students behind classroom may not be full because it has not heard the sound of you teachers and equipment for science experiments, which are available in the school, there is limited.
Students at the back of the classroom. Maybe students should be encouraged to not hear the teacher. Equipment and science experiments that are in school, they are limited.
The students in the back of the classroom. May learn not fully, because did not hear the teacher teach. And equipment science contained in the school is limited.