To the last anon: I just finished my psychology A levels and if you do the Edexcel exam board it's pretty damn easy, for that exam board it's mostly remembering details of studies (as in percentages of results, aims, blah blah). AQA requires overall understanding of theories, knowledge of biology (but it's only basic immunology as far as I've heard), and also basic knowledge of nerve impulses of neurons in both. It's not complicated at all if you do revision. (Sorry for butting in whoops)
Woah... I'm taking psychology for A levels next year and wow... it looks really complicated.