Low yield. Honestly, I can hardly remember any psych questions on my test.
Maybe a couple on the different schizo- disorders (-phreniform, -oid, -typal, -phrenia, -affective) and perhaps a couple on depression (Sx, med management, etc.)
All told, I probably had less than 10 pure psych questions. Don't go out of your way to study what isn't already in a question bank or a general review text.