Commerce is not required for Business Studies, although I believe it gave me a very good introduction to the course.
True, its not required but can give a very solid grounding for Business Studies
For some reason, the HSIE Coordinator at my school, she told us in Year 8 when we were choosing electives,
"Commerce is an excellent, practical course. I think taking it is good preparation for Legal Studies and Economics, if you're into that and want to do one or both of those subjects in Yr 11."
True also but it would equally help in Business Studies
It would only have been a tiny help anyway, I take back what I said about it helping you a lot, come to think of it - there's only one elective topic covering business in the Comm course 'Running a Small Business'.
You'll be completely fine!