Turkish to English Other Education / Pedagogy Meslek Lisesi Transkript

Column headings on this vocational secondary school transcript (Bakirkoy/Istanbul) for each of the classes taken include, "1st semester grade," "2nd semester grade," "year-end grade," et al. I am not sure I understand the difference between "tamamlama notu" (literally, "completion grade") and "bütünleme notu" (literally, "final grade"). There is no additional explanation provided by the school in the "comments/explanation" section of the transcript, and both terms seem like they could mean the same thing: FINAL GRADE. Does anyone know the difference? Thank you!