I did both AQA psych and sociology at A-level. Psychology was split into topics like research methods, memory, attachment, social influence, schizophrenia. It focuses on the mind/individual. Where as sociology is much more essay based and is focused on society. we had topics like families, education, research methods. we learned theories like marxisim, femenism and functionalism and applied those to the different topics eg why the education system is racist/sexist/classist and explanations for rising divorce rates and increased family diversity. As i said sociology is more essay based, I think you have 30 markers, where as psychology you have 16 markers max. They were both interesting, I got an A in psych and A* in sociology but it took much longer to understand sociology as i found there was less structure, however that may have just been my teacher and the bad text book we were given.