my university in madrid has an exchange program with BU. The program is simple: BU let me register in all the courses I wanted under the status of 'non-degree student'. I spent a year there and took the courses at BU that were closest to the ones I should have taken during that year (fourth of total of five) in Madrid. I initially did not expect them to be at the graduate level. I took QMI, QMII, Stat Mech, Intro. Solid State, Advanced Lab, EMI, Electronics, Class. Dynamics. Intro. Solid State, Adv. Lab and Electronics were more of a mix between seniors and grads.