I did the UTS bridging course (UNSW one was more expensive) and it was useless tbh. They go really fast and once you go behind you're lost for the rest of the lesson. I'd recommend doing it at your own pace via online sources such as khan academy or even hiring a private tutor for a few lessons.
Yeah I have to agree. For those who never did maths in year eleven and twelve, the bridging course is going to be very demanding. You will have to go home and revise each night for the duration of the bridging class to ensure you can keep up. I didn't find it completely useless because I did some ext maths in Year 10 so some of the stuff in there were like revision so in that sense, I did appreciate their speed and concentration on the key points.
At the end of the day though, it really comes down to your luck. A good lecturer makes all the difference.
For my algebra and functions class the teacher was just alright, but my calculus one was amazing so yer.
+1 for Khan Academy
A post-grad student told me about it and it's definitely worth checking out.