Data science is a good field you can do masters in data science after btech..there are many countries offering courses in data science...as far my knowledge New Zealand is the best

Sathak you can apply for exams like GATE,CAT.You can  also go for Ph.D.

Career in Information technology has high scope. Having expertise skills in coding,software tools will help you find best job offers. In other way, there are exams like GATE,CAT,GRE which will help you get opportunity for higher studies. GRE is best exam that gives a way to study abroad. Specialization subject should be your choice. 

This link will give you more details about aboard studies in M.S. in IT field

https://studyabroad.shiksha.com/ms-in-it-networking-from-abroad-ds11509275