Four years ago, officials at Drexel University (PA) looked at enrollment numbers — and didn’t like what they saw.  Only 8 percent of students offered admission had chosen to enroll, down from nearly 25 percent less than a decade earlier. With tuition, fees, and room and board hovering around $60,000, Drexel was showing up in rankings as one of the nation’s most expensive schools. And not enough of its freshmen were making it to graduation.