General Maths, Standard English, Visual Arts, Drama and CAFS.
Actually you don't need those, but I'm personally trying to get as many smart people to take them as possible so they scale high.
Because scaling is based, to put it as simply as possible, on how many smart people are doing a course, not on how hard the real-BoS think it is.
So follow the smart people at your school.
Or do stuff you're good at so you don't fail, because if you fail you can't get a 95 UAI.
Or you could be mundane and do physics and 4u maths.
This is the best advice you'll ever get.
Oh, the answer is yes. Just aim for 90+ in everything and you'll be sweet.