This site offers a massive PDF (often 50+ pages) specifically for N4. It includes every Kanji, vocabulary lists for each Kanji, and grammar points that use the Kanji.

N4 is where the Kun'yomi (Japanese reading) and On'yomi (Chinese reading) diverge wildly.

Downloading the is the easy part. The challenge is integrating it into a study routine that ensures retention. Here is a step-by-step methodology.