By JOHN SENA One day last fall, two fourth-grade boys at Cesar Ch vez Elementary School, an economically disadvantaged school on the south side, spent most of the morning flinging bits of eraser at each other. The teacher, in her first year in the classroom, tried everything.

By JOHN SENA Plan: El Dorado, Ramirez-Thomas, Sweeney to stay the same Three of Santa Fe's most crowded south-side schools would lose 680 students under a rezoning plan approved by the school board last week.