LL.M. applicants from non-English speaking countries applying to law schools in the U.S., U.K., Canada, or Australia will normally have to show, as part of their LL.M. application, that they possess the necessary English language proficiency to follow an LL.M. program. While there are other language tests that are accepted, the TOEFL is the most popular among law schools in North America.
Learn more about the TOEFL exam at http://www.legalenglish.com/llm/toefl.php