<p>
</p>
<p>I learned it from old Russian math textbooks. Awesome resources, but probably not very useful unless one knows the language. </p>
<p>I’ve never read “Art of Problem Solving”, but have heard good things about it, so it’s probably worth a shot.</p>
<p>
</p>
<p>Here’s some good stuff;</p>
<p><a href=“http://www.its.caltech.edu/~tmu/ph1a/problems.htm[/url]”>http://www.its.caltech.edu/~tmu/ph1a/problems.htm</a></p>
<p>I couldn’t find the chemistry problems (the websites for Ch1a and Ch1b have probably been taken down already), but the placement exam should give you a reasonable idea of what to expect.</p>