I'm super-happy about this: JLPT1 is a really great level to be at. It means that you more or less have the Japanese skills of a Japanese high school freshman. It is a minimum requirement for many jobs.
But even though I'm relieved, and happy, I'm not as happy as I thought I would be. Yes, I now have a nice shiny certificate, but I know exactly where my Japanese ability sucks. I know I can't read faster than I speak even for easy things, and for newspapers, not even that fast. I struggle with news reports or even following a conversation if there's more than about two other people. I know lots of kanji, but there's still plenty of very common ones that I don't know. Having the certificate that says that I'm more or less at this level doesn't change those.
Since I do have the certificate, I'm not going to take the test again in the summer. I'll take it again in December, a year after I took it last. Even if I don't do much vocab drilling or practice tests, I can study by watching movies and reading books too. I expect that my score should be higher in a year.