There have been at least 50 school shootings in the United States so far this year, as of September 19. Thirteen were on college campuses, and 37 were on K-12 school grounds. The incidents left 24 people dead and at least 66 other victims injured, according to CNN’s analysis of events reported by the Gun Violence Archive, Education Week and Everytown for Gun Safety.
https://www.cnn.com/us/school-shootings-fast-facts-dg/index.html
I don’t see the gva anywhere in that article and the numbers in the CNN article are pretty close to the numbers NPR was able to verify