It's really interesting. BUT most of the exam consists of remembering details from other peoples experiments/ case studies and describing and evaluating them including research methods and ethics. The actual specification doesn't require you to do your own experiments although we've done a few including replicating psychologists work and and seeing if our results match with theirs among the people in the class.
Like YB101 said, the longest questions at AS are 12 marks. For these I write a page and a bit. On the AS papers there's one of these on each aswell as a couple of 6-10 mark questions. But most of the questions are only a couple-four marks but even some of the four mark questions are split up into 2+2.
In the A2 exams though, there's 3 24 mark questions per paper (2 in the year).
The best way to pass is by doing all the 12 (AS)/24 (A2) mark essays that could possibly come up and memorising them. For my second exam at AS, that's about 25-30!!! BUT some of them are similar meaning that when I was writing them out for the first time, I could mix and match some paragraphs together. But it's not pointless even though only 1 12 marker comes up. You can just write them out but in slightly less detail for the 6-10 mark questions. And for the questions that are only a few marks, you just write out the most relevant paragraph or two of the most relevant 12 marker.