Just a word of warning, I took G544 this January and walked out with an A 97/100, however it was the worst exam I have ever sat.
It is possible to predict OCR psychology exams, however they also are known for using tricks.
As you may know in Section B of the exam there is usually a choice between methodology or approaches, instead we recieved two methodologies, which I was completely unprepared for, and caused absolute panic, with people leaving the exam hall nearly in tears.
I'm not saying they will do this again, but just make sure you know stuff from both approaches and methodologies.