Since I often see questions from other users asking about practice JLPT exams, I was interested to see an ad from kanshudo.com in my inbox announcing their JLPT Center, which “enables you to take timed JLPT tests, practice all of the various question types individually, and study curated lists of content.”
I’m not endorsing kanshudo. I do have a free account but I never use it, so I can’t say if it’s good or bad. Still, it’s another resource available to all you aspiring test takers.