Drongoski
I did my degree at Newcastle, I believe they only had recommended courses going in to a degree meaning that they didn't particularly stop you from being accepted if you had the atar but not the recommended requirements. One thing that did help me was in the first lecture the subject coordinator showed a graph of the previous year's results. Only 5% of the general math students that did the course the previous year passed. Wanting to be an engineer but not being able to pass the first maths course would have been embarrassing, so I made a study schedule and stuck to it from day one. All it took was attending lectures and tutorials along with an hour or so a night to make sure I understood the content and could do some example problems.
One thing that I noticed was that initially the 3u and 4u students had already seen the content before so they didn't feel the need to study. By halfway in the course when the content was new for them, I would do better than most of them in the weekly quiz, purely because of my study habits. They didn't believe me when I told them I did general maths in highschool and had beat them in a maths quiz.
I did have some fundamentals missing though, doing general wasn't ideal but once it got to the point where the content being taught was new for everyone then it didn't really matter as much. Looking back on it I enjoyed the maths courses and they obviously became extremely useful in other classes like thermo, fluid dynamics and reaction kinetics. Partial differential equations was the only math course I really struggled in and I honestly would have found it hard whether I had done 4u or not