I passed N1 in December despite having studied only half of the TRY! N1 book, which is equivalent to about1/3 of the N1 grammar on bunpro. My marks in the grammar section were terrible but that didn’t matter because the pure grammar section isn’t worth so many points, certainly not comparative to the amount of time it takes to learn all the grammar!
Tbh the most challenging thing about the exam is the huge (and at times random) range of vocabulary it includes, and the speed at which you have to be able to read. I would recommed focusing on vocab at least as much if not more than grammar, (depending on your current strengths of course) and practising reading with a focus on increasing your speed of comprehension.
If you live in Japan and spend a lot of time talking to/listening to Japanese people, the listening section is quite easy. I think for people that don’t live in Japan, this section can be hard - particularly the short response type questions.
Having said all that, I am now working my through all the rest of the N1 grammar on bunpro and some of the grammar I’ve now learnt is very helpful in understanding books/articles that I read- and would have probably sped me up in the exam! Although I still can’t get my head around the difference between every grammar point that contains して… 