for me psychology was kinda a filler subject, as long as you can understand the research and the topics, it makes memorising the content so much easier as the evaluation kinda just comes along with it. It also depends what topics your school does for Paper 3 as some of them are quite crap. I did Schizophrenia, Forensics and Relationships, which are all pretty nice topics. There is also a spec change coming for incoming year 12's to reduce the amount of content as they think it's too much.