First of all you need to decide what you want to do in the future. Do you want to be an engineer? Will you use your engineering degree? If not, then there's no point doing it. Do you want to be an accountant? Are you still deciding?
Be careful with the Bachelor of Commerce - Professional Accounting. Unless you're 110% you want to move into accounting, I'd probably recommend you try and gain a bit of flexibility with commerce. You can do this by either doing a standard Bachelor of Commerce, where you can choose up to two majors, or a double degree. I was studying the Bachelor of Commerce - Professional Accounting until I added on the Bachelor of Applied Finance as a double. My point is, the Bachelor of Commerce - Professional Accounting may confine you primarily to accounting and it may even damage your competitiveness because it's really easy to assume you're doing a normal Commerce degree with a major in "Professional Accounting" (even though this isn't the case).