Japanese Language Profciency Test

http://www.jlpt.jp/e/index.html

日本語能力試験（にほんごのうりょくしけん）のオフィシャルサイトです。
This is the official website of the Japanese-Language Proficiency Test. According to this website, The Japanese-Language Proficiency Test is conducted both in Japan and outside Japan to evaluate and certify the language proficiency of primarily non-native speakers of Japanese. (cited from the website)