No English translation or explanation of any of the vocabulary or kanji in lists, wasting tons of time forcing the reader to look up words, and not establishing any meaning or mnemonics to help memorize similar-looking symbols. Furthermore, furigana above kanji are way too small, straining the eyes and inviting errors in reading, particularly differentiating between " and °. It's way too easy to mistake a furigana reading from normal distance and then memorizing the wrong way to read a symbol.
Suggestions to the author for making the word lists more helpful, readable, and easily memorizable:
1.) Put English definitions next to each of terms in each list.
2.) Summarize the meaning of kanji, making it easier to tie together and memorize vocabulary using that kanji through relation.
3.) Include a picture or graphic with each word or kanji.
4.) Don't write furigana in such tiny font: use a font size as big as the kanji themselves, so it isn't so easy to mistake how to say them.
A really good book if you want to study kanji for the N1. (Or just want to study kanji.) It's not quite as easy to use as the N2, where you could easily do one unit per day, but it's still very well organized and fun to use. There are plenty of exercises and illustrations that make remembering the kanji relatively easy (although you probably need another book if you don't know the kanji at all beforehand).
After finishing this book, reading novels has gotten a lot smoother for me. I knew about 98% of the kanji in here, but there's a difference in kinda sorta knowing the meaning and actually knowing the reading and what it means. I've also gotten better at guessing the correct reading of unknown kanji composita. So, really helpful and useful! When it comes to kanji I actually feel rather confident, but N1 grammar is yet another matter...