J-CAT

https://nihongo-e-na.com/eng/site/id87.html

J-CAT provides you a Japanese language test and automatically evaluates the proficiency of the Japanese language on the computer. After the test, you will be provided a certificate of your score, so don't register with a funny foolish name! They also described that J-CAT wouldn't allow you immediate re-test by the same account. You can try and re-evaluate every several month and have your self confirm the growth.