The only advise I can give you is to do & learn your assignment diagrams
-> context dfd
->event/response list
-> system level dfd
and know your theory from the chapter review questions tut.
I think it's one of those exams where if you know your work it's really fair otherwise if you take a chance without adequate studying you can see your rear quite easily. imho.
Good luck with jan/feb, there might be a few of us that will be joining you after the results come out.
Hopefully everyone will give their 2 cents and you can make a rand.