Some people say that in order to pass the higher levels of JLPT, you need to either have good exam taking skills or study for the test with materials such kanzen master, while other immersion learners to claim that you can achieve top marks with immersion alone and minimal preparation. The latter claim does have same credence as shown by Jazzy and the doth’s achievements but I am not sure whether they are just outliers or not. Originally, I assumed that one could pass N1 by simply being good at Japanese, but a lot of test takers on JLPT reddit were suggesting that you do need actually need test skills and to have good reading comprehension in your native language to pass it. Everyone seems to have a different opinion the matter