Hello Akash,

 Since you want to apply to the top college like NUS or NTU which has already had a good reputation then what they basicall demand is that you must some good quality if research work apart from your GATE score and further requirements are as follows-:

• you have to write TOFEL with min score of 96
• You have to submit 2LORs and SOP
• Send your documents to their office 
• Fees is 20SGD for online and 40SGD for offline
• They basically judge you on your profile if you have just qualified for the GATE you will get a call

These are some other requirements 

• GOOD GPA(>8.00)
• CLASS 10 & 12 MARKS
• PUBLICATIONS
• WORK EXP
• SOP
• LORs
• ACTIVITIES
• TOEFL SCORE(>90 )
• INTERNSHIPS
• CONTRIBUTION TOWARDS RESEARCH
• PRIOR RESEARCH EXP
• PROJECTS