Hi Sahana,

First, I would like to know the subject and the country from which you are aspiring to do your MS. For studying MS abroad, usually, you are required to take a GRE test. Though it is not mandatory for all universities.
For management related programs, you may be required to take a GMAT.
The next step is the English proficiency test. There are a number of English proficiency test tests that you can take like TOEFL, IELTS, PTE etc. Again it depends on the university which one of these tests they accept.
Read https://studyabroad.careers360.com/study-abroad-entrance-exams to know the different exams required for studying abroad.

Do revert if you need more information.