GMAT : less than five years old. The minimum GMAT required is 600, with an average of 690 for the Class of 2012.
GRE: Taken on or after August 1, 2011. We strongly encourage candidates to submit a GRE score in or above the 65th percentile for the quantitative and verbal sections of the GRE.
TOEFL, TOEIC, IELTS, PTE - English is the only language required for admission. Non-native English speakers who do not hold a university degree from a university where English is the teaching language must submit test results showing English proficiency. These results must be less than two years old. Source