I remember doing the entrance test for Year 10 a couple of years ago, and if I remember correctly, there was a decent amount on trigonometry (I think some questions with bearing and all of that type of stuff). Think there might have been some quadratics and simultaenous equation q's as well (prolly like mid-level) and some basic algebra stuff (e.g. rationalising the denominator). I don't remember all too well but I'm pre sure a substantial portion of it was trig (don't know if they've changed it up now tho). if u know someone who did dr du in year 9, it'll prolly be the topics they did in t4 that you'll get tested on for the yr 10 entrance.