Why is post test important?

Why is post test important? The purpose for this is to determine how much a student has progressed after finishing a chapter of semester of work. You are correct in stating that the teacher will not share (or show) the pre-test mistakes to the student, because the student will then know what to expect for the post-test.

The purpose for this is to determine how much a student has progressed after finishing a chapter of semester of work. You are correct in stating that the teacher will not share (or show) the pre-test mistakes to the student, because the student will then know what to expect for the post-test.