Children take part in a protest demanding that public schools remain open, outside New York's City Hall on November 19, 2020. (KENA BETANCUR/AFP via Getty Images)A disproportionately large number of poor and minority students were not in schools for assessments this fall, complicating efforts to measure the pandemic’s effects on some of the most vulnerable students, a not-for-profit company that administers standardized testing said Tuesday.Overall, NWEA’s fall assessments showed elementary and middle school students have fallen measurably behind in math, while most appear to be progressing at a normal pace in reading since schools were forced to abruptly close in March and pickup online.The analysis of data from nearly 4.4 million U.S..