Important to note, easy subject =/= high grades at uni. I know that I'm going to be met with the, "it's okay, I'm dedicated, putting in effort is not going to be an issue!" - and I don't mean this in a mean way, just that I always give this advice and get met with the same response. Considering that only half the people I tell this to end up doing well, I just want you to be aware.
You have to be willing to put in effort at uni. This means that if doing a subject which is just a repeat of one you did in VCE is going to lead to you not doing work for it, it doesn't matter that you know the stuff - you'll still do poorly. However, if you pick the "harder" subject, and hence end up putting in more effort for it, you will do better.