You need at least 600 SGD regarding your food to survive in singapore. I think it should be very difficult if NTU doesn't provide cheap and on campus accommodation for you.
Regarding VISA please be informed that granting Singapore Employment VISA is not straightforward and with your situation, it will be totally random. In recent years some of the Iranian students who admitted for Ph.D. have been rejected for student VISA.
Thank you and have a nice ahead.
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