GPA: nearly 4 out of 4/ Internship: NASA or RIM or Caterpillar like that you can Imagine/ GRE: for princeton and UCB: Q=168+,V=160+,AWA=5.0+, for Germany: I think so they have there exam based on core Mechanical Engieering which is similar to GATE(Graduate Apptitude Test for Engg.)(Mechanical)(this test is conducted in India you can get previous test papers online also) but no GRE for ETH, Utokyo, and TUM, RWTH / should have multiple patents, some International papers like 15 or 20 i guess/ Projects : something around 10/12 whichever is your lucky number.
and thats it there you go with some 50% chances of luck