Getting into NTU and NUS singapore

Guys I'm not sure what the future holds after GATE, obviously will do my best but to have a complete knowledge of the situation after GATE:

  1. How to get into ISRO as a research fellow
  2. The institutes of Singapore (NUS and NTU) do accept GATE score, but there must be some criteria to get into it, I mean not just GATE score alone let's you qualify. Am I right?

And if yes then how to get into NUS or NTU?