Something you know will appear on the exam: the DSM. Here's the basic diagnostic information from the Trauma- and Stressor-Related Disorders chapter of DSM-5. Give it a look.
REACTIVE ATTACHMENT DISORDER. A consistent pattern of inhibited, emotionally withdrawn behavior toward adult caregivers and others connected to an experience of insufficient care.
DISINHIBITED SOCIAL ENGAGEMENT DISORDER. A pattern of behavior in which a child actively approaches and interacts with unfamiliar adults. Also has to be connected to a history have having received insufficient care.
POSTTRAUMATIC STRESS DISORDER (PTSD). Intrusion, avoidance, mood, and arousal symptoms for more than one month following exposure to actual or threatened death, serious injury, or sexual violence.
ACUTE STRESS DISORDER. PTSD symptoms occurring 3 days to 1 month after exposure to trauma.
ADJUSTMENT DISORDERS. Out of proportion emotional or behavioral symptoms in response to an identifiable stressor occurring within three months of onset.
Also in the chapter, OTHER SPECIFIED TRAUMA- AND STRESSOR-RELATED DISORDER and UNSPECIFIED TRAUMA- AND STRESSOR-RELATED DISORDER. It's possible that exam writers will test your knowledge of the Other and Unspecified areas of the DSM-5. It's much more likely that they'll focus on the actual disorders. The exam is meant to test competency for beginning social workers, not DSM-5 mavens.
Hope this helps. Happy studying and good luck with the exam!