M.S

Dear Sathiya,
Process and requirements vary. If you are looking forward to get into an American University, you must take the GRE and TOEFL to be considered for admissions. Universities in Europe do not seek any GRE scores, however might ask for one depending on your profile. Good essays, personal statements, letters of references are additional requirements and matters a lot. About your internship, if you are studying in a foreign university you can easily complete your internship from that particular country. Always look for universities having strong industrial tie-ups, co-op options, providing good career assistance etc.
Best of luck!

MIT, Georgia Tech, Cal Tech, University of California-Berkley, Cornell are some of top universities in USA. Which area of studies are you referring to?
Subject wise, certain universities are better ranked than the others. You may refer to ranking charts such as Times Higher Education Ranking, QS Ranking etc for more university standing.
An advice, since your GRE score is a little lower than the recommended score of 315, you must work hard on your application material such as the personal statement. Other factors affecting admissions include letters of recommendation and extra curricular activities. Remember, extra curricular is extremely important. Most importantly check the admission information and apply well ahead of the deadlines.