Well I can't decide it for you think about your own preferences and where you want to be!
You can't go for ACCA prior to Bcom. It requires CAT, graduation or 21 years of age (as far as I remember the rules).
I think going for graduation prior is a good approach. You said that you are to go abroad for ACCA then why you want to start it right now along with Bcom. Remember ACCA is quite tough and requires your full commitment.
We have some other members here who are certified accountants themselves and can guide you better. So wait for your query to be replied by them.
