This is gonna be pretty brief coz I can't be bothered explaining in detail atm. If you want more info then PM me.
The content is pretty easy and as a result the level of competition is higher, where top rankings are distinguished by only a few marks. In my personal experience, the subject is divided into two main components; content and structure. The majority will have a firm understanding of content but not everyone will be able to structure the answer to achieve full marks (capitalise on this). In other words, focus on structuring answers to maximise marks and do this by completing as many practise sacs and exams as is reasonable. To give you a general idea of how many you should be doing, I did 7 - 8 prac SACs before each SAC and somewhere between 20 - 25 prac exams. Do not fall into the trap of doing a crap ton of prac SACs/exams, what is equally or arguably more important is marking said SACs/exams. I should be clear, by marking i don't mean giving a numeric mark (this is pretty unimportant), but writing comments as to how you can improve answers (even those answers you achieved full marks on).
P.S. I'm happy to sell you my notes, PM if interested.