Is it worth prerparing early for uni or not? Im going into UNSW Computer Science this year.
No just enjoy the break. The only case I would say it's a good idea to prepare ahead is if you need to catch up on content in subjects you may not have undertaken. For example, to do MATH1131 you will need knowledge of the extension 1 maths content. In that scenario it would be important to do work prior.
Try to use this time between now and uni to work on other aspects such as health/fitness, applying for jobs, resting, hanging out with friends