Sara E. Rimm-Kaufman, a professor of education at the University of Virginia, said many teachers reached the end of their ropes this year when students returned to campus from two years of virtual learning. “Students have come to school with more needs than ever having experienced stress, trauma, and inconsistent conditions due to the pandemic,” Ms. Rimm-Kaufman said. “Plus, students have learning gaps. It’s hard to teach addition and subtraction of fractions if students didn’t learn about fractions last year.” She said trust between teachers and families has further broken down in recent batt...