Unlike USyd, UNSW does not set prerequisites for its degrees (as mentioned above), although it does inform applicants of which subjects are considered as assumed knowledge (where applicable), which is also the case of the Bachelor of Engineering (Honours)/Bachelor of Science (Computer Science). This means that the knowledge that you would have gained by taking Mathematics Extension 1 would be beneficial in terms of staying up to date with relevant content taught and would allow you to avoid falling behind. However, this does not mean that having this knowledge is compulsory and this will consequently not affect your chances of receiving an offer to study this program.

In terms of the assumed knowledge itself, i.e. if you wish to gain knowledge relevant to Mathematics Extension 1 before you commence your degree, you can do so by completing UNSW's Mathematics Bridging Course, which is designed to prepare you for entry into university programs that require first-year maths.

More information about this bridging course can be accessed using the following link:

UNSW Mathematics bridging course is offered twice a year. It covers subject areas including calculus, Newton’s method, induction and algebra.

www.science.unsw.edu.au

I hope this helps!