Why don't you attend an info session of INSEAD in Singapore, and check the relevant stats such as the average age group for recent entrants, the general profile of class, GMAT scores etc. It's really tough to say what your chances are right now because there are many things that will be taken into account when you apply to any B-School, and the key thing is to bolster your profile, and thereby maximize your chances of getting there. For that to happen, you need to be aware of your strengths in order to emphasize them more, and your weaknesses in order to justify them, or carefully guard them (not by deceiving any AdCom, of course). Lastly, try to connect with some INSEAD alumni and tap their knowledge.
Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)
GMAT Club Premium Membership - big benefits and savings