MUMFORD -- A little more than a decade ago, the tiny school district in this community of cotton fields and drying feed corn was a candidate for extinction: just 80 students, kindergarten through eighth grade, attending class in a 1925 schoolhouse. Today, it is the envy of Robertson County: three new campuses stocked with computer labs for all students, televisions and VCRs in every classroom, and consistently good scores on state standardized tests. The school district has made the most of school transfer laws. Eighty percent of its student body -- which is now at 444 and includes a high...