Hey Gupta,
NTU University
The entire Application procedure for when to apply, where to apply and what doccuments are to be submitted is provided in the following website link,
http://admissions.ntu.edu.sg/graduate/R-Programs/R-WhenYouApply/Pages/R-HowtoApply.aspx
NUS university,
For NUS University you can check everything detailed on the following website link,
http://www.nus.edu.sg/admissions/undergrad/apply/international/applications/WYA-applicationform.html
All the best!
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