Resources
Here are some resources to help you prepare for MATHCOUNTS and AMC competitions.
YouTube Videos
Websites
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AOPS is a must-have: lots of classes, textbooks, community, and resources; the hub for competitive math
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Mathdash is the “new” AOPS; contests, handouts, problems, comparable to Codeforces for programming
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Omegalearn is also really good, contains textbooks (kind of hard though), videos (very good explanations), and resources
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Math with Ms. Lin is a must-have, containing almost every past MATHCOUNTS test from 2000-2017
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TheBeautyOfMath contains guides for how to study and prepare, along with a lot of good explanations of math problems
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Po-Shen Loh contains livestreams going over MATHCOUNTS problems of all levels
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MATHCOUNTS Practice Plans has good videos and handouts, better for beginners
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MATHCOUNTS Minis is also really good, great handouts, goes over state-level problems
Problem Trainers
Classes
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AOPS Classes are paid, ideally take the subject math courses; contest prep courses are somewhat outdated
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AOPS Alcumus is the best one, can change through lots of different topics
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AMC Trivial is good for AMC 8 problems
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SAAB is a bit old, and some of the problems are hard
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MATHCOUNTS Trainer has problems with varying levels of MATHCOUNTS, NOT a little buggy