10聽說有個北京XDF有老師780. 個人覺得也要要根據個人情況覺得是否參加類似補習機構把。 In 10’s opinion, the functions of XDF are 1.to provide you basic information if you know little about GMAT ( CD can do much better, actually) 2.to make sure that you spent enough time --at least the hours at class-- learning GMAT (companions can do much better, actually) 3.to make you study harder through charging a large amount of money. (dream school can do much better, actually) at least 3 functions 10本人沒有上XDF,以上只是猜測,若有不當請見諒。