Not counting schools that fell off last year's list completely, there are 15 MBA programs that plunged by double-digits in 2017. But the biggest drop of all--a whopping 34 places in a single year--belongs to Britain's Henley Business School. The four schools that disappeared? St. Gallen (ranked 88th last year), North Carolina State (89), IIM-Ahmedabad (92), and Case Western University (96).