I think this is an interesting question!
I’m not taking the JLPT this time but I can tell you a bit about my previous experiences.
I have taken the N4, N3 and N2 - passed them all first try thankfully.
N4, I was riddled with anxiety. I feel like I have never been as stressed as I was back then (I was 17 mind you…). I passed, don’t remember my mark but I was thankful. I had studied every day, hard core, for over half a year (I had been studying at high school but took on extra study to do this test of course).
N3, I had been living in Japan for over a year. I had also studied Japanese at a university level. I was studying consistently but definitely wasn’t as stressed this time around. In fact, I wasn’t nervous at all going into it. I got a decent mark.
N2. Still living in Japan. I used textbooks to study, as well as Bunpro. I wasn’t stressed about the test but knew that I wasn’t as prepared as I was for N3 the previous year. That being said, I wasn’t nervous. I don’t seem to get nervous about tests anymore (this may be thanks to my extremely stressed 17 year old self). I passed the test but it wasn’t a great score.
I have never been confident going into a test, but I guess, once I get there, it all feels a bit inevitable? What’s going to happen, will happen. I kind of feel detached from myself - sounds a bit strange and it may be more of a me thing.
I do practice tests beforehand, to see where I’m at. I mainly focus on reading in the things coming up to the test though. It’s my weakest section. I struggled with it the most in N2 since they merge the reading and grammar sections together.
But these days, I don’t feel much about the tests I think. I think it felt high stakes the first time because it WAS my first time. The other times, I was trying because I wanted to, rather than because I was encouraged to (extra pressure during the first one for sure, from my teachers etc).