Commentary Parents whose kids excel in school need to be on guard. Leftist school administrators across the country—not just in New York City—are banning gifted programs in elementary and middle school and Advanced Placement courses in high school. Typically, without any notice to parents, an eight grader’s accelerated science class or a fifth grader’s fast-track math class is merged into the regular classroom. Top students lose out. They need accelerated programs every bit as much as children with learning challenges need special education. It’s discrimination. The left is seizing on a newly published study of Ohio students from the Thomas B. Fordham Institute to call for banning gifted programs. The study, “Ohio’s Lost Einsteins,” looks at what became of second and third grade students who were identified as high performers. By eighth grade, only 30 percent of black students, 39 percent of Hispanic students and 34 percent of economically disadvantaged …