why do you want to go through the pain and trauma again, literally there are so many ways to get into your course like doing a easier degree then transferring or going through a diploma then transferring.
But if you really want to go through the pain again, you can do it at TAFE, but they don't have all the HSC courses which may suck and your ATAR is literally just recalculated based on the new marks. The con is that you are literally wasting another year which could have pushed you further in your career.