Mathynomial is a database of math problems, including (most) past AMC problems. You can type in the answer and the system will tell you if you're right. You can browse by topic or (for AMC/AIME problems) by year and level.
If you sign in, you can also use the site to keep track of problems you've solved or gotten stuck on.
We will be offering AMC/AIME-level problem-solving classes in the future (fall 2017); visit this page to sign up for the mailing list to be notified when the next classes are offered.
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For questions or comments, please email firstname.lastname@example.org.