Students struggle with distance learning as grades show an increase in Ds and Fs The three largest school districts in Kern County released grade data from the past year, indicating a 14% increase in Ds and Fs for fall 2020 compared to fall 2019. and last updated 2021-02-24 12:51:38-05 BAKERSFIELD, Calif. (KERO) â The three largest school districts in Kern County released grade data from the past year, indicating a 14% increase in Ds and Fs for fall 2020 compared to fall 2019. This data depicts grades from students in grades 6 through 12 across the Kern High School District, Bakersfield City School District, and Panama Buena-Vista Union School District, representing 45% of the Kindergarten through 12th grade students in Kern County.