Generally, students' grades will be known, otherwise, as you said, teachers will not know how students' grades are. As for whether you will read your grades in public or call your parents, each teacher has different ways to deal with it. Of course there is a report card. I hope you don't get scolded for your poor grades, make good use of them and get good grades in the exam. None of this may be possible, and these actions of the teacher will only add luster to you. I am also a sixth-grade graduate student.