If you haven't passed USMLE Step 3, study for that exam instead of the PRITE and don't even worry about the PRITE until then.
After you've passed Step 3, then don't worry about the PRITE. Worry about the written board exam. Trust me, while the PRITE covers the same material, the PRITE and the board exam are very different in the types of questions they answer. Many of the PRITE exam questions IMHO are poorly written compared to the board exam.
If you've ever taken an SAT prep course you know what I mean. The prep courses teach you to prepare for the actual exam. The board exam questions IMHO are better and you'll learn psychiatry better than studying the PRITE.