I'm doing comp sci at UNSW without MX1 and also looked at this stuff:
Their assumed knowledge is pretty weird because they want 100 mark of Adv and ext 1 which is actually not much at all if you get a high B5/B6 in adv.
I'm learning programming stuff now but I'm gonna start math pretty soon to prepare and I've found some stuff to do for math. They have a playlist of math fundamentals which might be helpful and 'worksheets' which is what I think the assumed knowledge is supposed to be.
A useful collection of revision worksheets for mathematical topics treated as assumed knowledge within courses at the UNSW School of Mathematics & Statistics.
Also what I did is look at the course outline to see what math units I will actually need to do in semester 1 - once I've done the worksheets and fundamentals (if I try them and they're good) I will look for work specifically around those topics.