I'M DONE I'M DONE ASUDF90UASD8FU9S0ADF9SD8AFU LET'S GOOOOOOOOOOO
Actual review: if you want to get better at maths, you can't look down on this book. Sure, some chapters are very basic covering stuff like quadratics and coordinates, but other chapters may cover new content (e.g modular arithmetic, incenter circumcenter orthocenter), and even in the basic chapters you'll humble yourself by realising that there's a lot to unpack in the most simple concepts (e.g why probabilities are multiplied)
Of course, everyone is at a different level, but for anyone trying to built their fundamentals from the ground up this book is the perfect place to start. It provides a structured way to revisit your basics for older students (like me) and builds a comprehensive base for newer younger students. But of course, this book isn't perfect, so here are some of my criticisms+general thoughts:
1. Particularly in the modular arithmetic chapter, I felt like you didn't need to explain the basic modular rules using change of base, but a much simpler explanation could be arrived at using distributive law. Distributive law also explains the rules for -ve sign remainders e.g -3 mod 5
2. Some explanations can be very tedious sometimes (e.g angle subtended by same arc was massively overcomplicated). I think this book is best paired with a curious mind willing to explore new perspectives/approaches beyond it. When you find an explanation of a theorem you don't understand / are dissatisfied with, search it up on youtube/ask for help.
3. Be prepared to spend a lot of time on this book regardless of your skill level. I am an A level Further Maths student currently 17 years of age at the time of writing this review, yet I still managed to spend over 5 months of time reading through and completing everything AOPS1 has to offer. You may be better than me (e.g Math/STEM undergrad), you may be worse than me (primary/middle school student), but so long as you're not a prodigy/contestant with previous experience this book will seriously demand a lot of your time if you want to take the completionist route.
4. The book alone is not enough. Nobody can spend all of their time purely revisiting fundamentals, such will be very tiresome and demotivating. Get a tutor, preferably one that's IMO level/way above your skillset that can guide you through proof based questions way beyond your level once a week. I find that this is the best balance between revisiting/learning fundamental stuff that you can your own and simultaneously experiencing the growth from being pushed past your current limits.
5. Concepts require time to marinate. It's not an intelligence thing, but I think there's a limit to how fast you can progress especially with new content. Reading this book shouldn't be linear, skim through chapters that are easy and take your time with new stuff you haven't seen before.
Final remarks: overall, I've made some great progress with AOPS1. I really like how it teaches you the fundamentals of mathematics and not just the fundamentals of olympiad theorems, like sure it'll tell you about some geometry tricks but it'll also teach you e.g "why associative operations have an inverse" and "what is a transitive operator?" as well as basic proof writing and conditional logic (inverse, converse, contrapositive). One thing I'd like to reiterate though: get a tutor/mentor. You need to combine revisiting fundamentals with being pushed past your limits and honestly there's no better way to do that than with a mentor. And on that note, I'm signing off, giving this a deserved rating of 5/5. Excited to finally start reading AOPS2!