hi ! may i know any good universities in melbourne where i can do economics and finance ? particularly smth that has to do with stock trading/exchange industry .

Hi there forumers . I'm a college student looking to apply to melbourne u for bachelor of commerce . The problem is
1) I don't understand what they mean by the course subjects . When I checked online, they have different subjects for finance , econs , actuarial . Am I allowed to pick what subjects what I want ? Can someone explain to me clearly how the majors/subjects are supposed to work ?

2) what is meant by breadth subjects ?

3) how much does it cost rent a room / apartment in Melbourne ? Is it cheaper to rent a room or an apartment by itself ?

Thank you very much your answers will be appreciated.