I've been a huge fan and participant for years and years of this niche Tumblr group that's expanded to Instagram and Youtube since the early years of Tumblr's downfall. The niche is called "studyblr" or "studygram" it's pretty much just posting aesthetic pictures of pretty notes, desks, and stationery. It sounds strange, but it's a source of academic motivation for many Gen Z kids. From what I've seen, it also seems to be the source of the popularization of bullet journals, which people may be more familiar with.
I don't want to give this a star rating, because people interpret star ratings as the measure of the book's quality. As far as quality is concerned, it would be 4 - 5 stars, as the author @studyquill/Jasmine and her co-author put a good deal of work and thought into this. If I were to give a star rating based on its value to me, personally, I would give it a 1.
This is a book for people (mostly teens) to learn about bullet journaling and use it for school. It's meant for novices who know very little about it. It's almost a simplified version of Ryder Caroll's guide to bullet journaling. It provides nothing for those who already bullet journal and are looking to improve their system, layouts, or productivity. Essentially, for those who are already fans of studyquill, reading this book will just summarize all the content they've seen from her and other creators.
For these reasons, this book was a let down. However, it is extremely impressive that at her age, studyquill has turned her hobby into a source of income and has published a book about it. Props to her.