close Houston ISD schools narrow academic gaps after state takeover despite racism claims The district has eliminated its F-rated campuses and doubled the number of A and B-rated campuses, it said. NEW You can now listen to Fox News articles! FIRST ON FOX: The Houston Independent School District (HISD), the largest school system in Texas , has seen dramatic improvements in student grades and test scores across its more than 270 campuses in the years since a state takeover. The sweeping