There is no such criteria or restrictions tightly for GMAT score. The foreign universities take a lot many aspects of your career and life into account rather than just GMAT score. Your GMAT score is more of a neccessary condition but not a sufficient one. Nowadays some colleges even take GRE score into consideration. So it is just a test of standard aptitude and reasoning rather than being something which requires great scores. So stop worrying about your score in GMAT. Rather work on your profile and other aspects.