I am in year 10 currently. I feel like when I chose my electives I just chose the ones I thought would be fun or the ones that my friends were doing. Looking back, that was kind of a dumb move. I need 12 units for my HSC. Right now, I want to do 3u math, 3u english, chem, bio. I need 2 more units to fall back on and I don't know what to do because I am doing drama and psychology as my electives, both of which are not hsc subjects. i am thinking about doing economics but I don't know if I will be able to do it without any previous commerce, and if so, how much of a disadvantage will i have?