EducationWorld Q&A columnist Dr. Matthew Lynch is an associate professor of education at Langston University. Dr. Lynch provides expert advice on everything from classroom management to differentiated instruction. Read all of his columns here , and be sure to submit your own question . This week, reader Rebecca H. asks: I consider myself to be an effective classroom manager and disciplinarian. However, even though over 90% of my students are well behaved, I have three who have me at my wits’ end. I need to do something fast, because their misbehavior is starting t...