It is great to see students thinking outside the constriants of the hsc syllabus.
Just remember that the syllabus is a 'teaching outline' which identifies all main points and concepts students should learn.
So studying a little more than a syllabus point outlines is a great thing, not only because it will help you produce Band 6 responses in the exams, it gives you a greater understanding of chemistry in general.
Here are a few extra points to consider about the Haber Process:
1). Why is ammonia an important fertiliser, and what property enables it to be used as a good fertiliser?
2). Why is the Haber Process exothermic?
3). Give reason(s) as to why is the Haber Process a very slow reaction at standard conditions (room temperature and normaly room pressure)
Keep studying!
Cheers,
George