M.A Economics

For JNU, you have to cover a wider area of economics such as International Economics, Macro, Micro, Maths, Stats, Public Finance, etc. Sometimes they also ask logic and comprehension on economic case. Maths is majorly +2 based so revise your RD Sharma book and be ready to practice from past year paper.
Refer to the economics books of 11th and 12th. Also, other books you can refer are:-
1. Hal Varian, Intermediate Macroeconomics,7e
2. Rubinfeld and Robert Pindyck, Microeconomics
3. RGD Allen, Mathematical Analysis for Economics
4. AC Chiang, Fundamental Methods of Mathematical Economics
5. Sydsaeter and Hammond, Mathematics for Economic Analysis

The level of difficulty in MA Economics is actually depends upon you. If you didn't have studied maths at 12th level or if you don't shows interest in mathematics then it would be very much difficulty for you (Difficulty level can be 09/10). Because maths is the essence part of economics. Without the knowledge of maths, you won't be able to find the 'Time Value of Money', Bond and Stock valuation, Price determination under different forms of market, Managerial Economics. All these requires higher level knowledge of calculus, algebra and probability. The concepts of differentiation and integration helps you to formulate the policies by knowing the maxima and minima. If you are from non-maths background, then I will recommend you take tuitions of advance maths for your better performance during college. Otherwise it will be very difficult for you.
I hope this helps.
Best of luck.

For an engineering student, it is quite tough to go for Masters in Economic as in whole academic period, students study PCM and no economics, but in Master's degree, a student has to get in-depth knowledge in this subject and needs an introduction to economics before joining MA in Economics. As Economics is a complex subject so after a small introduction to an economics student can get some base for the syllabus and understand the syllabus easily. So, it is beneficial to do MA in economics as less engineering student do this and there is a scope in the finance field, industries, and banking & marketing field.
MA in sociology is the study of social relation, social satisfaction, social interaction and culture. So it is quite easy for a B.Tech student to study MA Sociology rather than MA Economics. A student having good knowledge and understanding can easily go through MA in Sociology. It is quite easy to score good marks in Sociology. After doing this, students can go for PhD. or M.Phil degree. Sociology student has a greater chance to qualify civil services exam or one can also apply for UGC-NET or JRE exam.
S, for engineering students, MA in Sociology is quite beneficial.