TEACHING STUDENTS TO SUCCEED Dear Heloise: I’ve been retired from teaching for about three years now, and I can tell you that classrooms need to change. Teachers need more authority, more money, and more cooperation from parents and the school district’s administration. We need to start failing students who don’t make the grade and have them repeat the year or attend summer school to make up for their bad grades. Lining students up in neat rows and expecting them to learn is boring to them. Why not use a semi-circle of rows like colleges do? And while I’m at it, why should high school end at 3…