yes psychology is a good choice. remember one thing,scoring trend is never predictable. apparently your subject combination seems fine.Psychology is easy to understand that's why it enables the candidate to write answers to conceptual question in a better manner.a cramming subject doesn't give you this opportunity.
one thing more, too many cooks spoil the broth, so don't indulge into asking so many people,seek guidance, get advice but don't get confused ever, its your game , so determine once and give a start to your preparation whole heartedly.
All the best.