<p>Ah, okay. It’s not an exclusive thing. Here’s the quote from the catalog: “Freshmen who have gained advanced placement into Ch 41 or Ch 21, or who are enrolled in Ch 10, are encouraged to take Ch 3 a in the fall term.”</p>
<p>EDIT: However, the chem department website says this:
“Enrollment first term will be limited to students who have gained advanced placement into Ch 41 or Ch 21, or by permission of the instructor.”
source: <a href=“http://chemistry.caltech.edu/courses/ch3a/index.html[/url]”>http://chemistry.caltech.edu/courses/ch3a/index.html</a></p>