The most common beginner words, grouped by topic so you can actually use them, not just recognize them on a test. These are the building blocks for real sentences.
Both the N5 and N4 exams score out of 180 points total, split into two sections: Language Knowledge and Reading (120 points) and Listening (60 points). You need 90 out of 180 overall, but you also have to clear a minimum score in each section separately, so one strong section can't cover for a weak one.
That means every minute you spend memorizing grammar has to actually earn points on test day. Some particles are simple enough that a little study locks in the point almost every time. Others have so many overlapping jobs and native-speaker gray areas that even hours of study won't make you meaningfully faster than a guess. Spend your limited prep time where it pays off, and treat the rest as a quick guess you move past.
If a question hinges on one of these four, take your best guess and move on. Chasing certainty here costs more time than it's worth.