IIT Kanpur - Indian Institute of Technology

For general category students, all those with 92 percentile and above were called for interviews and out which students have been selected on the basis of their cumulative scores for CAT and GD-PI.

Admission in B.Tech CSE at IITs is by appearing in JEE Mains and JEE Advanced. The upper age limit to be eligible for JEE Main is 25. Age limit is relaxed by five years for SC, ST, PwD candidates.

No, only engineers or M.Sc Maths.

Yes, in India CSE has a huge market demand.

You can earn more than 15 LPA.

Economics provides wonderful career opportunities and particularly in the current scenario. It is also a field that creates a lot of inspiration and interest among the students. The liberalization and e-commerce have provided new highs to the subject. It opens the flood gates of options to you once you are done with your graduation on this subject. The selection of a career for yourself should not be done in haste or out of someone's influence. Before making a decision assess your field of interest and pursue it as there is a sea of choice lying in front of you after economics graduation.

IIT, Kharagpur's electrical engineering should be your first priority when compared with IIT, Kanpur's mechanical engineering.
Computer science and electrical engineering are very high paying branches. Hence, they are always preferred by toppers.
On the other side, mechanical, known as the 'ever-green branch' is not as ever-green as it seems. The demand is not very high, neither low in the current scenario, but one thing for sure, this field is never destined to decline.

IIT Kanpur, IIT Delhi and IIT Roorkee are old and best institutes but as per the present rankings IIT Delhi holds a good position and it provides better placements.

I can say that both the institutions are renowned in terms of providing better education for the students. But to some extent, IIT-Kharagpur provides you better placement as compared to IIT-Kanpur.
All the best.