Things may vary culturally per program-
But if I were you I'd just focus on Step III, get that out of the way, screw the PRITE until Step III is passed.
As a first year, half the questions, you won't even know what the heck they're asking for. If you focus too much on the PRITE--you got into USMLE III-PRITE overload.
After you finished Step III, then just focus on psychiatry.
That's what I SHOULD'VE done.