History

No, you can as the questions are generally asked in English.

The students ranged from 60-70.

You can go for what you are good at. There are ample of opportunities in these subjects. You can even prepare for competitive exams. Do whatever you like the most. Every field has thousands of opportunities.
Best of luck!

Hello Kavita,
Both these subjects are good choices for doing PG. However from the perspective of landing a job, I think economics will beat history. This is so since it has many applications and tremendous opportunities are available in different fields to experts in this field. Be it personal finance, be it companies, as advisory, etc. while history has limited scope of teaching or few government jobs. Hence I would like to advise you that you should take economics.

Dear Manish, If you want to do graduation only then this university is good for you.

National Eligibility Test is to determine the eligibility criteria of the aspirants for lectureship and for the award of Junior Research Fellowship. The UGC NET July 2018 Exam was conducted for 84 different subjects by the Central Board of Secondary Education. The forthcoming exam will be organized by NTA (National Testing Agency) announced by Mr. Javedakar. To know more about the NET Exam, visit here - https://www.eduncle.com/cbse-ugc-net-exam
It will be beneficial for you to appear in NET Exam with sociology as you mastered in this subject. But, If you want then History subject can also be taken to appear in this exam.

There are total of 46 seats.

Hello Arun,
Like any other University, NEHU also conducts entrance exam for admissions in MA in different subjects. The syllabus of this exam is invariably the same as that for graduation. As you must have done graduation in history, it should not be a problem for you to clear this entrance exam.
Best wishes.