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It depends on where you are from. In the USA the best schools are Stanford University, Carnegie Mellon University, UC Berkley and MIT. In Europe University of Oxford, University of Cambridge, University College London, Imperial College London and Swiss federal college of technology. In Asia, I have no idea. Despite the school's reputation, I think you should look into the details for each college and select the ones that you find interesting and you think can give you the education that you are looking for.