The use of standardized tests to measure very young students keeps expanding, The Washington Post reports. Now public charter schools in Washington D.C. will soon be giving new standardized tests to very young children — aged 3, 4 and 5 — for the purposes of assessing their academic progress and ranking schools according to the results. What will be optional for each school is whether to evaluate students in social-emotional learning, which early childhood experts say should be at the center of education for the youngest students.This move in D.C. charters is part of a disturbing shift in early childhood classrooms around the country, as they increasingly mimic what older students do academically…