Well I'm in year 13 and have nearly finished my final exams, however, I've completed all of the psychology exams. I personally believe psychology isn't that challenging. For context, I am predicted an A*, the revision can be left to the final month before your exams and you can succeed. I don't believe it's possible to retain all the context for all 3 papers all together. So definitely choose psychology in my opinion, and contrary to popular belief they're concerned more with your knowledge rather than your memory- so unless they're a key psychologist, you can just mention "empirical evidence tells us". If your college or sixth form does AQA psychology well you'll definitely enjoy the first year content, personally I loved psychopathology- we looked at depression, anxiety, OCD, therapies etc- things that have real-life application. A lot of psychology is relevant, it's not outdated like history. The year 2 content is slightly more difficult (as expected), actually it just occurred to me, my friends also did biology+chem+psychology and psychology involves a decent amount of biology- there's a whole topic called biopsychology that you visit in year 1 and 2, and biology is generally scattered everywhere- so definitely do psychology. universities will struggle to see the link when you choose history as well, it'll be hard to incorporate into your personal statement. I know people that did history A level and they hate it so much, if you check the student room chats for the recent history exams that have been sat , you will how negative their reviews and thoughts of the exams have been. Your 2 science subjects are already a lot of content, don't overwork yourself and set yourself up by choosing history. Psychology, although it's not a throwaway subject that should be taken for granted, it definitely requires effort and work (as expected) but it comes naturally and you shouldn't get too exhausted. Like for some exams you can revise 2/3 days before, the content is recoverable for sure!!! dm me if you want any further advice or equally reply here I don't mind.