<p>Does it matter which subjects you choose?</p>
<p>That question is really general... and it really depends on the colleges/programs you're applying to... if it's more geared towards math/science then obviously take one of the math/science ones... generally it's a good idea to take a math subject test...</p>
<p>Note that some universities (like Caltech) REQUIRE that you take particular tests. Look at the web sites of the universities you want to apply to; you may find guidelines and/or requirements as to which tests you should take; if there are none, I say just take whatever you can score best at.</p>