<p>I took a couple of Penn classes in my major (math). It was not at all difficult to get the classes I wanted, but then again, math classes don’t usually fill up. After you sign up for your first Penn class, you will get a “PennKey” to access Penn’s internal registration system (“Penn inTouch”). There you can see which classes are open and which have already filled up. (Unlike Penn students, you can’t actually use the system to register for classes because everything has to go through Haverford’s registrar; but I still recommend using it just to see which classes are open.)</p>
<p>Logistics-wise, I found it the most practical to keep my Penn days separated from my Bi-Co days. The commute felt super stressful in one semester when I had a Bryn Mawr class in the morning followed by a Penn class in the afternoon. Spending a full day at Penn also enabled me to go to departmental seminars and public lectures in the afternoon and TA sessions at night.</p>