There are dozens of business school rankings out there. In this video, Jose Ferreira, the founder of Knewton, tells you which ones are worthwhile—and which ones to skip. He also points to a fascinating feature behind those rankings: the strong correlation between students’ GMAT scores and their first-year, post-MBA salaries. As Jose explains, a high GMAT score is money in the bank. He’ll show you exactly why the toughest business schools are worth shooting for.