Keep in mind that I did this as part of my breadth and it was done in the Summer Semester. The Summer Semester lecturer and Semester 1 lecturer aren't the same. So some of my comments may be specific only to the subject taken over the Summer.
If you have a good solid foundation in music theory, then this subject should be a breeze; However, if you're used to the notation used for harmony in AMEB music theory, you're going to have to get used to Figured Bass notation - but this isn't too hard and you can often reason out what chord it's representing. The contact hours are quite low and because of the weekly assessments, there isn't that sudden need to cram for the end of semester exam, so stress levels are generally also quite low.
The weekly assessments start out at a weighting of 8% and gradually increase to 12% alternating between composition and analysis. Get out your coloured pencils for the analysis tasks because you're going to have to use them to circle motifs and identify links in the piece. You're given a sample of what an analysis looks like so use that as a template of how you're going to go about the analysis. For composition, I recommend not being too creative. If you try making your compositions too complicated, there's a greater chance of making mistakes (ie. parallel 5ths, incorrectly doubled 3rds etc.) and they're penalised quite heavily.
For the end of semester assessment, it's split into 2 parts, the written and the listening.
Don't underestimate the listening exam, it's worth 10% and of each piece they ask you to name the work and movement (if applicable), the composer, the period (late baroque, early baroque, medieval etc.) and what type of piece (quartet, symphony, motet, aria etc.). The last piece is one that isn't on the listening list and you're supposed to make an educated guess on the period, instrumentation and any other notes on melody, structure, or other note worthy aspects of the excerpt. I recommend just doing a little bit of listening each week. You're only assigned 3 or 4 pieces per week, so it shouldn't take you too long. Although I know how much of an annoyance this can be, but how you approach your listening of the assigned works is very important. I recommend, whilst listening, to make a note of the instrumentation, language of the lyrics (if applicable) and other distinguishing features. For example, there was one piece that only had harpsichord and a string instrument playing together, so it was easy to identify when it came up on the exam.
The written component is split into two, and much like the assignments, it's an analysis of a piece (10%) and harmonisation (10%). The harmonisation isn't too difficult, it's a 4-part harmony. Just look over your assignment and try to identify the kinds of errors you've made. The analysis shouldn't be too much of a challenge either. I recommend first identifying the key and check for modulations (accidentals make this obvious), particularly to the 6 related keys. Try to see if the modulations occur in sequence. Identifying modulations should be able to give you a rough idea of structure. Once you've done this, and if you have the time, try to look for motifs and at the melodic line.
Overall, this is a very manageable subject. However, learn from my mistake and don't let the listening get the better of you; because of commitments and general laziness, I'd only done about half of the listening before the week of the exam and ended up cramming the other half of the listening the day before. Even though I most likely got 8 or 9 out of 10, these really aren't the kinds of marks you want to be losing.