Using Kanzen Master as the main thing and Bunpro on the side is a good idea.
Its much easier to search for grammar points on Bunpro than it is on Kanzen Master. After finishing the grammar points on Kanzen Master you can continue using Bunpro (and other websites / books if necessary for extra info).
I also think that you will be set for the grammar section, considering how many practice questions there are in Kanzen Master.
(Assuming you are taking the December 2021 N2 exam)
Don’t worry about listening until November to have more time to build vocab / comprehension. Try to do some N1 listening exams as normally the JLPT exams are harder…
I would focus on reading and building up your Kanji / Vocab knowledge initially. There is a lot of reading on the N2 exam. Good reading speed is really important. Check out the new Reading Practice Section on Bunpro :D. Going through JLPT reading practice exams are a great idea too, not just manga , light novels , articles. hehe.
For vocab / kanji, writing on paper helps. There is WaniKani, Anki, Renshuu, Kanji Senpai and other Space Repetition Systems which (I think) help boost vocab / kanji knowledge.
Towards the end, please try to do some mock exams as the time limit really affects things