I agree that you should not regreat, but forget the past, but learn from it. I did 2 major works in year 12- art and t/d. They took so much of my time- because i wasent very orgainsed with my time, and I was also sick in year 12, which made it worse. I got marks that I never thought i'd get tho- I thought id get 60's in art when i ended up getting 80 ( i think it was because i had last minute tutoring from a certain uncle who happens to be an art teacher and HSC marker)
But now im in uni, ive learnt from high school that you have to manage time well and balance your time spent with your subjects equally. Uni requires much more time management because no one cares if you have 34929 assignments due in the same week. Uni projects take a lot more time and research effort into them, so you cant leave them till the last minute as you could in high school. Now im in uni and im getting high distictions and distictions in my assignments because ive managed my time much better and put more effort into them.
So if ur going to uni, forget the HSC, just learn from ur past mistakes and do better.