One of the books I used in my JLPT review was the Unko Books. Unko means Poop in English. Funny right? But after completing the Unko book 2, I felt the need to continue with the rest of their poop series.
Basically, the unko book is a kanji drill book. All kanji example will be used in relation to poop. It’s easier to understand. It’s hilariously entertaining. This is a good way to start your kanji study. Please note I skipped the Unko book 1 since I have a pretty good review of the kanji included in that book. At the end of each unko book, there’s a summary of all kanjis in one page so you can use it as a guide in case you forgot their reading. Also, the arrangements of the kanji is systematic. Meaning the first one you study will always be in relation to the next kanji so you can easily remember them.
Also if you are going to use this in Japan, make sure not to open it in public as it will be eye-catching for the Japanese :D. I am done with my book 4 and I need the book 5 soon.
Again, this will help you in your kanji study but you will need to use another book for grammar and cd for listening skills.