If you take an Australian qualification there is no need to get ACCA. But if you want to be a CPA in Singapore you need to go through the usual process of attending the one week provisional course, work 3 years in a CPA firm in Singapore, and apply for CPA membership. (That applies even if you have ACCA)
I repeat - there is no need to get both your accounting degree/post grad + ACCA... this could save you the unnecessary agony of taking the ACCA final level (having an accounting degree/post grad would probably entitle you to exemption from quite a lot of modules in ACCA, but it is the final module that is tough and you have to pass them all within the year)
tq so much for ur advice!