nah you're right, i came from accelerated at private school to selective and its still pretty hard taking y10 math again at selective. i still do well, just not as well as i thought i would doing it the second time around hha
i think what they mean is that penrith has a really good math unit for junior years. They do things faster than lots of other schools and my Penrith focus class teacher even said that the y10 syllabus at Penrith is one of the best. he said senior year maths here sucks apparently though. but yeah...