Hello,

Here are the list of some of the countries and their best colleges:-

* Germany

1. Technical University of Munich
2. RWTH Aachen University
3. Karlsruhe Institute of Technology
4. Technical University of Berlin

* United States of America ( U.S.A )

1. Stanford University
2. Carnegie Mellon University
3. Harvard University
4. Princeton University
5. Massachusetts Institute of Technology

* China and Hong- Kong

1. Tsinghua University
2. The Hong-Kong University of Science & Technology
3. Peking University
4. Chinese University of Hong-Kong
5. University of Hong-Kong

* United Kingdom ( U.K )

1. University of Oxford
2. University of Cambridge
3. Imperial College London
4. UCL College of London
5. University of Edinburgh

* Japan and South Korea

1. The University of Tokyo
2. KAIST – Korea Advanced Institute of Science & Technology
3. Seoul National University
4. POSTECH – Pohang University of Science & Technology
5. Kyoto University

Hope this helps!