Teachers shall administer the approved marking system or other approved means of evaluating pupil progress. The teacher shall maintain the responsibility and right to determine grades and other evaluations of students within the grading policies of the District based upon his or her professional judgment of available criteria pertinent to any given subject area or activity for which he or she is responsible. Teachers will issue class rules and grading procedures to all students in their classes. No grade or evaluation shall be changed without notification to the teacher concerning the nature and reasons for such change; and if such a change is made, the person making the change shall assume the responsibility for determining the grade or evaluation, and shall initial such a change. Teachers will keep major tests and finals for one semester. If a grade is to be challenged, it must be challenged during that time frame.