First thing first, congrats on your score. Its pretty good.
Secondly, go to NUS/FASS if you appreciate freedom of learning
and academic depth.
But be forewarned that SMU has the edge in biz fluff, because
their focus is less on those qualities I just mentioned. And that
SMU way-of-learning is also useful in itself. So it depends on what
you want.
You have any idea what Econs in NUS is like?
Its math, math and more math. With the exception of a couple of
professors, the vast majority love to bamboozle students with
math.
Absolutely nothing like JC Econs. Be forewarned again!