Mind you, I already (extremely messily) did N5 and N4 once before, so take this with a grain of salt.
I am on my second effective rerun this time, and what I’ve done so far has worked quite well for me:
I started with N5 grammar and vocab at the same time, where I did 5 grammar points every day and 20 vocabs every day. Once I was finished with the grammar, I focussed solely on the N5 vocab, and I did 30 vocabs every day, since learning a vocab involves way less effort than a grammar point. By doing this, I’m giving myself the time to properly reinforce the N5 grammar that I’ve learned so far through SRS, which I think is quite important since a lot of grammar is based on having a good understanding of the N5 grammar.
I recently finally finished the N5 vocab as well, and have now added the N4 grammar and vocab deck as well. The previous N5 pace was fine since I didn’t have any older reviews coming up, but part of my daily reviews are all of the material that I’ve learned previously, so I’ve reduced my learning to 5 N4 grammar points and 10 N4 grammar points.
If I have the correct date, the JLPT is on December 7th, which is in 128 days.
If you were to do my method, you would need 700/30=24 days to get all the remaining N5 vocab.
Then, to get all the N4 grammar points you need 178/5 = 36 days after that, and simultaneously starting N4 vocab on my pace would mean 1100/10 = 110 days, for a total of 110+24=134 days, so that’s just about too slow.
However, since you want to go for 3 N4 grammar points a day, you could also choose 15 N4 vocabs per day, so that would mean 1100/15=74 days, so with the 24 days that would be 24+74=98 days, giving you 30 more days to reinforce everything.
So basically:
- Finish your N5 vocab at either A: 30 items per day (24 days) or B: 25 items per day (28 days)
- Start N4 grammar and N4 at the same time after finishing N5 vocab. (Part of my first burn-out with grammar was keeping on going with N4 and even N3 without having a good base, so I HIGHLY recommend solidifying that grammar through reviews, while using that time to learn more grammar as well.)
- Do 3 N4 grammar points per day (done after 60 days, giving you 44(A) or 40(B) days to master that grammar)
- Do 15 N4 vocabs per day (done after 74 days, giving you 30(A) or 26(B) days to master the vocab)
However, I don’t know how much time you have per day, so be sure to adapt anything if it feels unmanageable.