If you are looking for what are the criteria I was referring in my previous comment. Below are few critical points which scores big during in a selection process (be it PR or citizenship):
- Individual's family ties to Singaporeans
- Economic contributions in our society
- Individual's educational qualifications (passing out from a premier institutes have an advantage)
- Candidate's age plays a role as Singapore is one of the senior people society so preference given to younger generation
- Individual's family profile means if your family is already part of Singapore society then chances are higher for you to adopt our culture and values
- Overall length of residency in Singapore