Washington University in St. Louis — criticized a decade ago for rock-bottom low-income enrollment — says it has carved out spaces for economically disadvantaged students as part of a new plan to increase need-based aid. Late last year, the university announced that 21% of its freshmen were Pell eligible, meaning they showed financial need after filling out a federal student aid application, and 17% were the first in their families to attend college. Currently, Pell-eligible students make up around 18.5% of Ivy League students and 40% at other institutions, according to a study by policy analysts at the HEA Group.