Students leaving feedback in school helps improve student's performance in schools. It allows teachers to thoroughly investigate and see how they can improve the class better. It allows teachers to create better studying materials or improve their teaching methods which in turn would improve a student's grades and allow students to do better in school.
There is a myriad of teaching software that is available where the student perform surveys to test a teachers propensity to do a good job in the particular learning discipline. Software makes it viable and very valuable for the teachers to know what the students have to say about teaching.