NTU / NUS top tier
SMU / SUTD top but below NUS / NTU in terms of popularity and credibility
SIT / SUSS mid tier, known, GES survey shows good employment rate with decent pay but of course, below both the top tier unis.

Kaplan aka kumlan, SIM, private uni, RMIT bla bla - garbage tier. Good luck with your 30% employment rate GES with 40% below average salary.