<p>As to the number of courses:</p>
<p>A “typical” undergrad degrees requires 120 or so credits. That works out to typically 15 credits a semester.<br>
You can take a minimum of 12, and a maximum of 21.</p>
<p>I’m insane, and the lowest I’ll ever take is 17. But yeah.</p>
<p>As to AP credits, Don_Quixote is right. You cannot use AP credit towards gen chem and gen bio at washu if you want to take an advanced class (you can get elective credits for bio 101,102 or something like that, but I’m not sure it’s worth anything, especially if you’re premed).</p>