So I just finished the HSC and I'm looking at doing BSc (Adv) but I'm really not sure what major I want to do just yet. I've been told that it is encouraged to take a wider variety of sciences in the first year but I'm just wondering what that actually means. I know that I don't really like biological sciences so have eliminated majors based on that. Should I be enrolling in level 1 physics, chemistry and maths as that is probably going to be common to a lot of majors I might be interested in? Looking at the majors' program guides, it suggests to take certain subjects at each stage...so for instance Earth Science has GEOS1111 and GEOS1121 in stage I. Am I going to be at a disadvantage if I haven't completed these when I go to second year if for instance I decided to do that major? Just as an example.