Caltech's Ph.D. comprehensive examinations usually don't come till the second year. The first year all you have to do is go to classes, five courses a term. But that involves 80 hours a week of reading, and getting just three hours a night of sleep is not uncommon.
加州理工的博士資格考大多訂在第二年，第一年就要把課修完，一學期五門課，除了上課，每週念書八十小時，每天睡三小時是很普通的現象。