its simple, participation grades. they were already doing this int he early 2000s, it began with if you made slightly under a D- , or an F thats close to a D, or C you get a C. nowadays you have to pass people no matter what, because the schools dont get funding. the SIMPSON episode where lisa cheated on a test, and the principal begged her not to report it because it funds the school, since shes pratically the genius students that is raising her schools statistics up, they cant afford a fail/expel.

plus in HS they have all these useless class for struggling students that they shunt them to be babysat so the school doesnt lose funding if they fail the core classes.

when i was in CC, my math prof(terribl prof) said people were graduating HS with only 9th grade math, and this pretty generous to be honest, so many people were in arithemetic classes when i was in CC. and english only 10th grade comprehension, this includes writing.