School shutdowns last year created devastating academic, economic, and mental consequences among K–12 students that could last into their adulthoods, a new report published by McKinsey & Company found. The impact of school shutdowns on K–12 students was significant, leaving them, on average, five months behind in mathematics, and four months behind in reading by the end of the school year, according to the analysis. Historically disadvantaged students were hit the hardest. In math, students in majority Black schools ended the year with six months of unfinished learning and students in low-income schools with seven, the report states. High school students were more likely to drop out of school, and high school seniors, especially among low-income families, were less likely to attend postsecondary education, McKinsey found. Of the 16,000 parents McKinsey surveyed in all 50 states, 35 percent said they were very or extremely concerned about their children’s mental health. A year …