Chemistry - Conquering Chem with Jacaranda Chem (has practicals) + Contexts (for easy understanding - but don't rely on it)
Economics - Tim Riley (Rely on more) + Tim Dixon (Read before making notes from Riley, also good for times when you don't understand Riley, can make some notes if he explains it better)
Maths 2U and 3U -
Definitely Cambridge (Main one), Fitzpatrick and maybe Terry Lee.
Sorry I don't do 4 unit, but trust other people
I heard Cambridge 4 unit is bad.
Please
AVOID these ones below for maths, unless you're struggling with basic concepts:
- Maths in focus (Seriously this is a yucky book!)
- Jones and couchman (ewwwww)
- Understanding year 12 maths or something (simple questions)