<p>Which math courses, besides basic ones such as high school algebra and Pre Calculus, are useful for the AMC test? And subsequent tests to determine entrance into USAMO?</p>
<p>Take all math up to precalc. Anything else (besides combinatorics or number theory classes) won’t help you, since the AMC series of tests limits its content to precalculus math.</p>
<p>Where can I find courses/help in Number Theory & Combinatorics?</p>
<p>Art of Problem Solving has AMC, AIME, and USAMO prep classes:</p>
<p>[AoPS</a> School Class List](<a href=“http://www.artofproblemsolving.com/School/classlist.php]AoPS”>http://www.artofproblemsolving.com/School/classlist.php)</p>