It Depends...
For example on what subjects you might be considering to take further down the road and what time you're considering on doing them. Looking at the units you'd want to be taking in the future
ACCG 200, ACCG 101, ACCG 201 they all require either ACCG 105 or ACCG 100.
From what Ive heard ACCG 105 is relatively easier than 100, but ACCG 105 is only offered in semester 2 as its more of a general subject for other degrees
So you might want to consider doing ACCG100 in semester 1 and ACCG 101 in semester 2. (entirely up to you but you get a neater timetable)
With the Comp and ISYS, again up to you and what subjects that might require what as a prerequisite
If you like computers and are considering doing some computer subjects as a future elective a lot of COMP units require COMP 115.
Other comp units include ISYS 114 or ISYS 123. ISYS 123 being the easier of those 2.
STAT 170 is easier than STAT 171.
Also a further note, you'll need to do MKTG 101 and BBA102 to qualify for an Associate Membership of the Australian Institute of Banking and Finance.
Here is an outdated guide:
http://www.efs.mq.edu.au/?a=11170
Btw Im looking at an outdated handbook, so you might wanna check up...on things...
Sorry if Ive confused you more : <
and welcome to Macq.