Enrollment at University of Wisconsin System schools dropped 1% this fall compared with a year ago when it was down 2%, the university reported Wednesday based on preliminary figures. Enrollment was up 6% at the flagship Madison campus, an increase of 2,564 students over last year. But it was down at 10 of the 12 other four-year campuses. Only UW-Green Bay, which grew 3%, and UW-Superior, which was up 2%, had increases.