From the ASWB which administers most exams--just not California:
No content related to DSM-5 will appear on the exams until July 2015. [Everywhere but California.]That's most people--49 states plus Canada. If you're taking the exam between now and July, '14, study DSM-IV-TR. People in sunny CA have to put down their surfboards and get their DSM-5 knowledge together sooner. From the California BBS:
Exam administrations December 1, 2014 and after: DSM-5 [California only.]Two different exam administrators, two different times to expect to see DSM-5 questions on the exam. Since everyone's eventually going to be using DSM-5 diagnoses, the California people may have an advantage in that they don't have to dig into two different DSMs. But it's not hard to imagine a big, everywhere-but-California sigh of relief at getting to push that particular information loading down the road some.
Wherever you are, whichever DSM you're learning, good luck!