graduate admissions - Is it a good idea to go to a university just because of its high international ranking?

I'm an international student and I'm currently studying pure mathematics in undergraduate level with a relatively low GPA (~3.5/4.0). I've recently read so many positive reviews about the universities in Singapore. I checked the "National University of Singapore (NUS)" on the internet for its international ranking and it was ranked 9th in mathematics!

How much do you think the ranking of a university positively affects my future career? For example, one of my dreams is that I can study in some Ivy-league university in the USA or some grand ecole university in France like Paris Sud 11 in the future, but because of my low GPA I'm afraid that that will never happen for me. Do you think that going to the NUS can help me to get accepted into world top universities in the future?