Hi Valu,
             As you mentioned for GRE, so go for it. It is most prestigious exam for BTECH students.
Also yes definitely you will get your stream as well. & when it comes to abroad, you will get more opportunities & exposure.
So, if you can able to go abroad, so please go abroad. & do internships.
& when it comes to choosing university, first you score well in GRE, then you will have lots of time to think.
I will recommend you to go for CANADA or USA. Because, in that countries specially in USA, lots of Top companies headquarters are their & you will get a great kick in career from the beginning.
Hope you get it.
Best of luck for your future.

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