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The Art of Problem Solving MathCounts trainer: https://artofproblemsolving.com/mathcounts_trainer
Prime number song https://youtu.be/rK7i5XBtQPs?si=HJWnTBuJLu4f2WBV
Saab MathCounts practice tests. Generates a test. After you submit your work, the complete solution of every problems will be displayed and you will be given the following choices: Repeat the test with the same problems, Repeat the test with the missed problems, Start over with a new test. In all the choices above, the problems will be chosen with different parameters. http://mathcounts.saab.org/mc.cgi