<p>It depends on where you’re applying. Some colleges don’t even require them. Also keep in mind that some (ie Harvard or Princeton) want 3. Also depends what you’re majoring in.</p>
<p>If you’re engineering, you need MathII + a physical science. So you’d probably do Bio and MathII for sure. Take Chem if you still remember it. Take Physics if you’re taking it this year and are willing to study ahead on your own time.</p>
<p>Also, top colleges won’t hold it against you if you have a low score. Say they ask for two, but you submit three. If they’re all strong, then your reader will bring up all three. If one of your scores is crap, however, the initial reader won’t mention it in front of the admissions committee. Of course, that assumes they’re not asking for any specific tests. If they require Math II for engineering apps, they’ll discuss that score even if it’s your weakest.</p>