Hey! I did UMEP Philosophy this year, not exactly the same subject but I'm assuming the structure and coursework will be relatively similar. Not sure what kind of readings will be set for your subject, but if they are primary sources, then I would say the hardest part is actually comprehending and digesting the content. However, if you're someone like me who likes to take shortcuts, there are plenty secondary sources on the internet (summaries, reviews, etc) that can make your life a whole lot easier in this regard.
Assessment wise, for Philosophy it's pretty much impossible to get 90+, I've heard you actually need to produce 'original' philosophy and critique which is pretty difficult given that the primary sources you're supposed to comment on are couple of hundred years old w/ thousands (if not more) of articles of existing commentary. Don't know about your subject specifically though, but I doubt the standards will be significantly higher/lower.