If you have finished Minna no Nihongo I & II (the Shokyu / Beginner series), congratulations! You are officially at an N5 and N4 level.
Let’s break down how to find the right book, what file you actually need, and the legal (and free) ways to study. minna no nihongo n4 book pdf
My advice? Try the first. If you love the layout, buy it legally. If you just need grammar points to pass the test, use the free websites above. If you have finished Minna no Nihongo I