Even if you are studying from a digital PDF, keep a physical grid notebook next to you. Write each Kanji out at least 10 to 15 times while actively saying its meaning and reading out loud. Muscle memory plays a massive role in Japanese language acquisition. 4. Do Not Skip the Practice Quizzes
The book is split into two parts: N5 (11 lessons, 110 kanji) and N4 (20 lessons, 200 kanji). nihongo challenge kanji n4-n5 pdf