The top local stories this morning from KERA News: Several charter schools have some of the state’s largest class sizes. The Texas Education Agency says most public schools in the state had about 22 students per teacher during the 2016-17 school year. More than half the schools averaging at least 30 students per class were charter schools, according to The Dallas Morning News. Charter school officials say many charters use teacher aides, which can skew class averages.