Business Analytics, Finance and Mathematics. Is this one degree combined or 3 separate concentrations in one degree?

My first thought is look through the job postings and look for the requirements of your interest. Which kind of employers look for mathematics? Can they accept mathematics from a PT degree? What will be your salary compensation? Apply these questions to your other degrees shortlist.

Same for business analytics. The buzzword here is Big Data instead. What kind of employers employ big data? IMHO, singapore is always slower in terms of implementing these new technologies. You will need to know more about programming, technology such as hadoop and such. Just a IT role. Think about it.

Finance. you pretty much said it yourself. fits your background.