The Japanese-Language Proficiency Test (JLPT) is the largest-scale Japanese-language test for evaluating and certifying the Japanese proficiency of non-native speakers in the world. Whether you're just curious about the level of your Japanese ability, or would like certification of your Japanese skills as a qualification for future employment, the JLPT is a good way to measure your Nihongo skills.
The JLPT is conducted twice a year, in July and December. Applications for the July test close on Fri. 14 April, so if you're thinking of sitting the examination, it's time to get your application together.
There are five levels of the test, from N5 through to N1 (N1 being the most advanced). For more information on the JLPT, the registration process, suggestions for textbooks to help you prepare, and some sample questions to help you decide which level to aim for, check out the official website.

When: Sun. 2 Jul.
Application period: From Fri. 24 Mar. until Fri. 14 Apr. (17:00)
How to apply: See the official Japanese Language Proficiency Test website below for full details.
Website: https://info.jees-jlpt.jp/