Does anyone know of some good AMC 12 prep textbooks? I’ve completed AoPS Volume 1. I’m not necessarily looking for more challenging problems, just an extension of what I’ve already covered.
Thank you 
Hello again @e_w_13,
I remember you are a few years ahead in high school math, but I don’t have a good feel where you are with contest math, which covers some topics often not covered in high school, or covered at minimal depth there.
The full set of AoPS books can be found here: Math Book Store - Print and Online | AoPS
The students who were serious about competition math at a young age might have all of the 6-12 grade books. But for you, the first thing I would suggest is Volume 2, followed by books on the topics you are finding difficult. Perhaps that’s number theory, or probability.
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