http://handbook.mq.edu.au/degree.php?id=21076
hmm, clicking on the links below it looks like you can choose an area??
(quick crash course since i didn't know ANYTHING this time last year. 100 level - first year subjects, 200 level - 2nd year etc. (generally). each subject is worth a certain number of credit points (cp), like units for the hsc. to get a degree you have to do the subjects they tell you to, plus a specific number of cp. since the subjects they tell you to do are generally less than the required cp, you can fill the rest of your degree with whatever else you want to do.)
take for example, "chemistry"
"At least 12 credit points of CHEM units including at least one of CHEM325 or CHEM329 and at least one of CHEM330 or CHEM331"
so you have to look at those courses, pick which ones you want to do. to do them you will have to do prerequisites, so look at the 100 and 200 level subjects you have to do as prerequisites. then the rest can be electives, of any kind, as long as you satisfy the requirements.
... - i think. the only thing that sounds suss to me is that you can do bsci and then make it totally based on one area such as chem, that's why i am not sure