Global opportunities for higher study are far more diverse. It is so because of the available options in terms countries and educational institutes.
Primary countries that student look to are:
USA
Canada
Germany
UK
Australia
Different countries and different universities in these countries may have different admission criteria. You have to search for the institutes most suitable to you through different criteria.
Primary tests that student have to clear are:
GRE (Visit Site)
TOEFL iBT (Visit Site)
IELTS (Visit Site)