 Middle and high school students in Fairfax County will get the chance to retake tests next year. That's one of the grading changes the county public schools have made for the 2024-2025 school year. Students who want to boost their scores on final projects or tests that make up 70% of their grade can take them again to try to boost the score. The school system is also establishing a D minus letter grade and shifting the grading scale slightly for D, D minus and F grades.