Officials at Liberia’s largest university say that every one of the nearly 25,000 students who took an entrance exam failed, casting a harsh spotlight on the country’s educational system. The official explanation was that for the first time the test was graded using raw scores; in the past, applicants had been graded on a curve. Students have expressed outrage at the results, accusing university officials of pocketing exam fees and then denying them admission. University officials offered a plan to relax admission standards to enroll 1,626 students.