Which lectures should be useful? Should i got to the managing study life lecture, is it any good? What does not sure which degree to choose going to involve?
In all honesty, I never found a reason to go to those lectures about general university life. Any information should be in written form on the UNSW website anyway and much of it is common sense.
What I would recommend you do is go to as many lectures regarding degree programs if you can, especially if you are on the fence with a certain few.