In most educational systems, student grades are cumulative. This means that they carry over from one reporting period to the next, and are typically used to calculate final grades for the school year or term. The purpose of cumulative grading is to track student progress over time and provide a comprehensive record of their academic performance.
However, some schools and educational institutions may have different grading policies, so it's important to consult the specific grading policies and procedures provided by your school. Some schools may have interim reporting periods where a small portion of grades are reset and a baseline established.