Ive been told to choose 3 favourites and study up on them. I wrote summaries of important ideas on all of them and went into greater detail on my favs. You never know which one you will need, it depends a great deal on the question.
My brother does a TAFE course, its called a TPC (Tertiary Preperation Certificate). Ive had a look at his work, its easier than general maths. Apparently if you dont get a good uai, TPC is a very common course to do that can raise it.